//! moment.js

;(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined'
    ? (module.exports = factory())
    : typeof define === 'function' && define.amd
    ? define(factory)
    : (global.moment = factory())
})(this, function () {
  'use strict'

  var hookCallback

  function hooks() {
    return hookCallback.apply(null, arguments)
  }

  // This is done to register the method called with moment()
  // without creating circular dependencies.
  function setHookCallback(callback) {
    hookCallback = callback
  }

  function isArray(input) {
    return input instanceof Array || Object.prototype.toString.call(input) === '[object Array]'
  }

  function isObject(input) {
    // IE8 will treat undefined and null as object if it wasn't for
    // input != null
    return input != null && Object.prototype.toString.call(input) === '[object Object]'
  }

  function isObjectEmpty(obj) {
    if (Object.getOwnPropertyNames) {
      return Object.getOwnPropertyNames(obj).length === 0
    } else {
      var k
      for (k in obj) {
        if (obj.hasOwnProperty(k)) {
          return false
        }
      }
      return true
    }
  }

  function isUndefined(input) {
    return input === void 0
  }

  function isNumber(input) {
    return typeof input === 'number' || Object.prototype.toString.call(input) === '[object Number]'
  }

  function isDate(input) {
    return input instanceof Date || Object.prototype.toString.call(input) === '[object Date]'
  }

  function map(arr, fn) {
    var res = [],
      i
    for (i = 0; i < arr.length; ++i) {
      res.push(fn(arr[i], i))
    }
    return res
  }

  function hasOwnProp(a, b) {
    return Object.prototype.hasOwnProperty.call(a, b)
  }

  function extend(a, b) {
    for (var i in b) {
      if (hasOwnProp(b, i)) {
        a[i] = b[i]
      }
    }

    if (hasOwnProp(b, 'toString')) {
      a.toString = b.toString
    }

    if (hasOwnProp(b, 'valueOf')) {
      a.valueOf = b.valueOf
    }

    return a
  }

  function createUTC(input, format, locale, strict) {
    return createLocalOrUTC(input, format, locale, strict, true).utc()
  }

  function defaultParsingFlags() {
    // We need to deep clone this object.
    return {
      empty: false,
      unusedTokens: [],
      unusedInput: [],
      overflow: -2,
      charsLeftOver: 0,
      nullInput: false,
      invalidMonth: null,
      invalidFormat: false,
      userInvalidated: false,
      iso: false,
      parsedDateParts: [],
      meridiem: null,
      rfc2822: false,
      weekdayMismatch: false,
    }
  }

  function getParsingFlags(m) {
    if (m._pf == null) {
      m._pf = defaultParsingFlags()
    }
    return m._pf
  }

  var some
  if (Array.prototype.some) {
    some = Array.prototype.some
  } else {
    some = function (fun) {
      var t = Object(this)
      var len = t.length >>> 0

      for (var i = 0; i < len; i++) {
        if (i in t && fun.call(this, t[i], i, t)) {
          return true
        }
      }

      return false
    }
  }

  function isValid(m) {
    if (m._isValid == null) {
      var flags = getParsingFlags(m)
      var parsedParts = some.call(flags.parsedDateParts, function (i) {
        return i != null
      })
      var isNowValid =
        !isNaN(m._d.getTime()) &&
        flags.overflow < 0 &&
        !flags.empty &&
        !flags.invalidMonth &&
        !flags.invalidWeekday &&
        !flags.weekdayMismatch &&
        !flags.nullInput &&
        !flags.invalidFormat &&
        !flags.userInvalidated &&
        (!flags.meridiem || (flags.meridiem && parsedParts))

      if (m._strict) {
        isNowValid = isNowValid && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0 && flags.bigHour === undefined
      }

      if (Object.isFrozen == null || !Object.isFrozen(m)) {
        m._isValid = isNowValid
      } else {
        return isNowValid
      }
    }
    return m._isValid
  }

  function createInvalid(flags) {
    var m = createUTC(NaN)
    if (flags != null) {
      extend(getParsingFlags(m), flags)
    } else {
      getParsingFlags(m).userInvalidated = true
    }

    return m
  }

  // Plugins that add properties should also add the key here (null value),
  // so we can properly clone ourselves.
  var momentProperties = (hooks.momentProperties = [])

  function copyConfig(to, from) {
    var i, prop, val

    if (!isUndefined(from._isAMomentObject)) {
      to._isAMomentObject = from._isAMomentObject
    }
    if (!isUndefined(from._i)) {
      to._i = from._i
    }
    if (!isUndefined(from._f)) {
      to._f = from._f
    }
    if (!isUndefined(from._l)) {
      to._l = from._l
    }
    if (!isUndefined(from._strict)) {
      to._strict = from._strict
    }
    if (!isUndefined(from._tzm)) {
      to._tzm = from._tzm
    }
    if (!isUndefined(from._isUTC)) {
      to._isUTC = from._isUTC
    }
    if (!isUndefined(from._offset)) {
      to._offset = from._offset
    }
    if (!isUndefined(from._pf)) {
      to._pf = getParsingFlags(from)
    }
    if (!isUndefined(from._locale)) {
      to._locale = from._locale
    }

    if (momentProperties.length > 0) {
      for (i = 0; i < momentProperties.length; i++) {
        prop = momentProperties[i]
        val = from[prop]
        if (!isUndefined(val)) {
          to[prop] = val
        }
      }
    }

    return to
  }

  var updateInProgress = false

  // Moment prototype object
  function Moment(config) {
    copyConfig(this, config)
    this._d = new Date(config._d != null ? config._d.getTime() : NaN)
    if (!this.isValid()) {
      this._d = new Date(NaN)
    }
    // Prevent infinite loop in case updateOffset creates new moment
    // objects.
    if (updateInProgress === false) {
      updateInProgress = true
      hooks.updateOffset(this)
      updateInProgress = false
    }
  }

  function isMoment(obj) {
    return obj instanceof Moment || (obj != null && obj._isAMomentObject != null)
  }

  function absFloor(number) {
    if (number < 0) {
      // -0 -> 0
      return Math.ceil(number) || 0
    } else {
      return Math.floor(number)
    }
  }

  function toInt(argumentForCoercion) {
    var coercedNumber = +argumentForCoercion,
      value = 0

    if (coercedNumber !== 0 && isFinite(coercedNumber)) {
      value = absFloor(coercedNumber)
    }

    return value
  }

  // compare two arrays, return the number of differences
  function compareArrays(array1, array2, dontConvert) {
    var len = Math.min(array1.length, array2.length),
      lengthDiff = Math.abs(array1.length - array2.length),
      diffs = 0,
      i
    for (i = 0; i < len; i++) {
      if ((dontConvert && array1[i] !== array2[i]) || (!dontConvert && toInt(array1[i]) !== toInt(array2[i]))) {
        diffs++
      }
    }
    return diffs + lengthDiff
  }

  function warn(msg) {
    if (hooks.suppressDeprecationWarnings === false && typeof console !== 'undefined' && console.warn) {
      console.warn('Deprecation warning: ' + msg)
    }
  }

  function deprecate(msg, fn) {
    var firstTime = true

    return extend(function () {
      if (hooks.deprecationHandler != null) {
        hooks.deprecationHandler(null, msg)
      }
      if (firstTime) {
        var args = []
        var arg
        for (var i = 0; i < arguments.length; i++) {
          arg = ''
          if (typeof arguments[i] === 'object') {
            arg += '\n[' + i + '] '
            for (var key in arguments[0]) {
              arg += key + ': ' + arguments[0][key] + ', '
            }
            arg = arg.slice(0, -2) // Remove trailing comma and space
          } else {
            arg = arguments[i]
          }
          args.push(arg)
        }
        warn(msg + '\nArguments: ' + Array.prototype.slice.call(args).join('') + '\n' + new Error().stack)
        firstTime = false
      }
      return fn.apply(this, arguments)
    }, fn)
  }

  var deprecations = {}

  function deprecateSimple(name, msg) {
    if (hooks.deprecationHandler != null) {
      hooks.deprecationHandler(name, msg)
    }
    if (!deprecations[name]) {
      warn(msg)
      deprecations[name] = true
    }
  }

  hooks.suppressDeprecationWarnings = false
  hooks.deprecationHandler = null

  function isFunction(input) {
    return input instanceof Function || Object.prototype.toString.call(input) === '[object Function]'
  }

  function set(config) {
    var prop, i
    for (i in config) {
      prop = config[i]
      if (isFunction(prop)) {
        this[i] = prop
      } else {
        this['_' + i] = prop
      }
    }
    this._config = config
    // Lenient ordinal parsing accepts just a number in addition to
    // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
    // TODO: Remove "ordinalParse" fallback in next major release.
    this._dayOfMonthOrdinalParseLenient = new RegExp((this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) + '|' + /\d{1,2}/.source)
  }

  function mergeConfigs(parentConfig, childConfig) {
    var res = extend({}, parentConfig),
      prop
    for (prop in childConfig) {
      if (hasOwnProp(childConfig, prop)) {
        if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
          res[prop] = {}
          extend(res[prop], parentConfig[prop])
          extend(res[prop], childConfig[prop])
        } else if (childConfig[prop] != null) {
          res[prop] = childConfig[prop]
        } else {
          delete res[prop]
        }
      }
    }
    for (prop in parentConfig) {
      if (hasOwnProp(parentConfig, prop) && !hasOwnProp(childConfig, prop) && isObject(parentConfig[prop])) {
        // make sure changes to properties don't modify parent config
        res[prop] = extend({}, res[prop])
      }
    }
    return res
  }

  function Locale(config) {
    if (config != null) {
      this.set(config)
    }
  }

  var keys

  if (Object.keys) {
    keys = Object.keys
  } else {
    keys = function (obj) {
      var i,
        res = []
      for (i in obj) {
        if (hasOwnProp(obj, i)) {
          res.push(i)
        }
      }
      return res
    }
  }

  var defaultCalendar = {
    sameDay: '[Today at] LT',
    nextDay: '[Tomorrow at] LT',
    nextWeek: 'dddd [at] LT',
    lastDay: '[Yesterday at] LT',
    lastWeek: '[Last] dddd [at] LT',
    sameElse: 'L',
  }

  function calendar(key, mom, now) {
    var output = this._calendar[key] || this._calendar['sameElse']
    return isFunction(output) ? output.call(mom, now) : output
  }

  var defaultLongDateFormat = {
    LTS: 'h:mm:ss A',
    LT: 'h:mm A',
    L: 'MM/DD/YYYY',
    LL: 'MMMM D, YYYY',
    LLL: 'MMMM D, YYYY h:mm A',
    LLLL: 'dddd, MMMM D, YYYY h:mm A',
  }

  function longDateFormat(key) {
    var format = this._longDateFormat[key],
      formatUpper = this._longDateFormat[key.toUpperCase()]

    if (format || !formatUpper) {
      return format
    }

    this._longDateFormat[key] = formatUpper.replace(/MMMM|MM|DD|dddd/g, function (val) {
      return val.slice(1)
    })

    return this._longDateFormat[key]
  }

  var defaultInvalidDate = 'Invalid date'

  function invalidDate() {
    return this._invalidDate
  }

  var defaultOrdinal = '%d'
  var defaultDayOfMonthOrdinalParse = /\d{1,2}/

  function ordinal(number) {
    return this._ordinal.replace('%d', number)
  }

  var defaultRelativeTime = {
    future: 'in %s',
    past: '%s ago',
    s: 'a few seconds',
    ss: '%d seconds',
    m: 'a minute',
    mm: '%d minutes',
    h: 'an hour',
    hh: '%d hours',
    d: 'a day',
    dd: '%d days',
    M: 'a month',
    MM: '%d months',
    y: 'a year',
    yy: '%d years',
  }

  function relativeTime(number, withoutSuffix, string, isFuture) {
    var output = this._relativeTime[string]
    return isFunction(output) ? output(number, withoutSuffix, string, isFuture) : output.replace(/%d/i, number)
  }

  function pastFuture(diff, output) {
    var format = this._relativeTime[diff > 0 ? 'future' : 'past']
    return isFunction(format) ? format(output) : format.replace(/%s/i, output)
  }

  var aliases = {}

  function addUnitAlias(unit, shorthand) {
    var lowerCase = unit.toLowerCase()
    aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit
  }

  function normalizeUnits(units) {
    return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined
  }

  function normalizeObjectUnits(inputObject) {
    var normalizedInput = {},
      normalizedProp,
      prop

    for (prop in inputObject) {
      if (hasOwnProp(inputObject, prop)) {
        normalizedProp = normalizeUnits(prop)
        if (normalizedProp) {
          normalizedInput[normalizedProp] = inputObject[prop]
        }
      }
    }

    return normalizedInput
  }

  var priorities = {}

  function addUnitPriority(unit, priority) {
    priorities[unit] = priority
  }

  function getPrioritizedUnits(unitsObj) {
    var units = []
    for (var u in unitsObj) {
      units.push({ unit: u, priority: priorities[u] })
    }
    units.sort(function (a, b) {
      return a.priority - b.priority
    })
    return units
  }

  function zeroFill(number, targetLength, forceSign) {
    var absNumber = '' + Math.abs(number),
      zerosToFill = targetLength - absNumber.length,
      sign = number >= 0
    return (sign ? (forceSign ? '+' : '') : '-') + Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber
  }

  var formattingTokens =
    /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g

  var localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g

  var formatFunctions = {}

  var formatTokenFunctions = {}

  // token:    'M'
  // padded:   ['MM', 2]
  // ordinal:  'Mo'
  // callback: function () { this.month() + 1 }
  function addFormatToken(token, padded, ordinal, callback) {
    var func = callback
    if (typeof callback === 'string') {
      func = function () {
        return this[callback]()
      }
    }
    if (token) {
      formatTokenFunctions[token] = func
    }
    if (padded) {
      formatTokenFunctions[padded[0]] = function () {
        return zeroFill(func.apply(this, arguments), padded[1], padded[2])
      }
    }
    if (ordinal) {
      formatTokenFunctions[ordinal] = function () {
        return this.localeData().ordinal(func.apply(this, arguments), token)
      }
    }
  }

  function removeFormattingTokens(input) {
    if (input.match(/\[[\s\S]/)) {
      return input.replace(/^\[|\]$/g, '')
    }
    return input.replace(/\\/g, '')
  }

  function makeFormatFunction(format) {
    var array = format.match(formattingTokens),
      i,
      length

    for (i = 0, length = array.length; i < length; i++) {
      if (formatTokenFunctions[array[i]]) {
        array[i] = formatTokenFunctions[array[i]]
      } else {
        array[i] = removeFormattingTokens(array[i])
      }
    }

    return function (mom) {
      var output = '',
        i
      for (i = 0; i < length; i++) {
        output += isFunction(array[i]) ? array[i].call(mom, format) : array[i]
      }
      return output
    }
  }

  // format date using native date object
  function formatMoment(m, format) {
    if (!m.isValid()) {
      return m.localeData().invalidDate()
    }

    format = expandFormat(format, m.localeData())
    formatFunctions[format] = formatFunctions[format] || makeFormatFunction(format)

    return formatFunctions[format](m)
  }

  function expandFormat(format, locale) {
    var i = 5

    function replaceLongDateFormatTokens(input) {
      return locale.longDateFormat(input) || input
    }

    localFormattingTokens.lastIndex = 0
    while (i >= 0 && localFormattingTokens.test(format)) {
      format = format.replace(localFormattingTokens, replaceLongDateFormatTokens)
      localFormattingTokens.lastIndex = 0
      i -= 1
    }

    return format
  }

  var match1 = /\d/ //       0 - 9
  var match2 = /\d\d/ //      00 - 99
  var match3 = /\d{3}/ //     000 - 999
  var match4 = /\d{4}/ //    0000 - 9999
  var match6 = /[+-]?\d{6}/ // -999999 - 999999
  var match1to2 = /\d\d?/ //       0 - 99
  var match3to4 = /\d\d\d\d?/ //     999 - 9999
  var match5to6 = /\d\d\d\d\d\d?/ //   99999 - 999999
  var match1to3 = /\d{1,3}/ //       0 - 999
  var match1to4 = /\d{1,4}/ //       0 - 9999
  var match1to6 = /[+-]?\d{1,6}/ // -999999 - 999999

  var matchUnsigned = /\d+/ //       0 - inf
  var matchSigned = /[+-]?\d+/ //    -inf - inf

  var matchOffset = /Z|[+-]\d\d:?\d\d/gi // +00:00 -00:00 +0000 -0000 or Z
  var matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi // +00 -00 +00:00 -00:00 +0000 -0000 or Z

  var matchTimestamp = /[+-]?\d+(\.\d{1,3})?/ // 123456789 123456789.123

  // any word (or two) characters or numbers including two/three word month in arabic.
  // includes scottish gaelic two word and hyphenated months
  var matchWord =
    /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i

  var regexes = {}

  function addRegexToken(token, regex, strictRegex) {
    regexes[token] = isFunction(regex)
      ? regex
      : function (isStrict, localeData) {
          return isStrict && strictRegex ? strictRegex : regex
        }
  }

  function getParseRegexForToken(token, config) {
    if (!hasOwnProp(regexes, token)) {
      return new RegExp(unescapeFormat(token))
    }

    return regexes[token](config._strict, config._locale)
  }

  // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
  function unescapeFormat(s) {
    return regexEscape(
      s.replace('\\', '').replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
        return p1 || p2 || p3 || p4
      }),
    )
  }

  function regexEscape(s) {
    return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')
  }

  var tokens = {}

  function addParseToken(token, callback) {
    var i,
      func = callback
    if (typeof token === 'string') {
      token = [token]
    }
    if (isNumber(callback)) {
      func = function (input, array) {
        array[callback] = toInt(input)
      }
    }
    for (i = 0; i < token.length; i++) {
      tokens[token[i]] = func
    }
  }

  function addWeekParseToken(token, callback) {
    addParseToken(token, function (input, array, config, token) {
      config._w = config._w || {}
      callback(input, config._w, config, token)
    })
  }

  function addTimeToArrayFromToken(token, input, config) {
    if (input != null && hasOwnProp(tokens, token)) {
      tokens[token](input, config._a, config, token)
    }
  }

  var YEAR = 0
  var MONTH = 1
  var DATE = 2
  var HOUR = 3
  var MINUTE = 4
  var SECOND = 5
  var MILLISECOND = 6
  var WEEK = 7
  var WEEKDAY = 8

  // FORMATTING

  addFormatToken('Y', 0, 0, function () {
    var y = this.year()
    return y <= 9999 ? '' + y : '+' + y
  })

  addFormatToken(0, ['YY', 2], 0, function () {
    return this.year() % 100
  })

  addFormatToken(0, ['YYYY', 4], 0, 'year')
  addFormatToken(0, ['YYYYY', 5], 0, 'year')
  addFormatToken(0, ['YYYYYY', 6, true], 0, 'year')

  // ALIASES

  addUnitAlias('year', 'y')

  // PRIORITIES

  addUnitPriority('year', 1)

  // PARSING

  addRegexToken('Y', matchSigned)
  addRegexToken('YY', match1to2, match2)
  addRegexToken('YYYY', match1to4, match4)
  addRegexToken('YYYYY', match1to6, match6)
  addRegexToken('YYYYYY', match1to6, match6)

  addParseToken(['YYYYY', 'YYYYYY'], YEAR)
  addParseToken('YYYY', function (input, array) {
    array[YEAR] = input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input)
  })
  addParseToken('YY', function (input, array) {
    array[YEAR] = hooks.parseTwoDigitYear(input)
  })
  addParseToken('Y', function (input, array) {
    array[YEAR] = parseInt(input, 10)
  })

  // HELPERS

  function daysInYear(year) {
    return isLeapYear(year) ? 366 : 365
  }

  function isLeapYear(year) {
    return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0
  }

  // HOOKS

  hooks.parseTwoDigitYear = function (input) {
    return toInt(input) + (toInt(input) > 68 ? 1900 : 2000)
  }

  // MOMENTS

  var getSetYear = makeGetSet('FullYear', true)

  function getIsLeapYear() {
    return isLeapYear(this.year())
  }

  function makeGetSet(unit, keepTime) {
    return function (value) {
      if (value != null) {
        set$1(this, unit, value)
        hooks.updateOffset(this, keepTime)
        return this
      } else {
        return get(this, unit)
      }
    }
  }

  function get(mom, unit) {
    return mom.isValid() ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]() : NaN
  }

  function set$1(mom, unit, value) {
    if (mom.isValid() && !isNaN(value)) {
      if (unit === 'FullYear' && isLeapYear(mom.year()) && mom.month() === 1 && mom.date() === 29) {
        mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value, mom.month(), daysInMonth(value, mom.month()))
      } else {
        mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value)
      }
    }
  }

  // MOMENTS

  function stringGet(units) {
    units = normalizeUnits(units)
    if (isFunction(this[units])) {
      return this[units]()
    }
    return this
  }

  function stringSet(units, value) {
    if (typeof units === 'object') {
      units = normalizeObjectUnits(units)
      var prioritized = getPrioritizedUnits(units)
      for (var i = 0; i < prioritized.length; i++) {
        this[prioritized[i].unit](units[prioritized[i].unit])
      }
    } else {
      units = normalizeUnits(units)
      if (isFunction(this[units])) {
        return this[units](value)
      }
    }
    return this
  }

  function mod(n, x) {
    return ((n % x) + x) % x
  }

  var indexOf

  if (Array.prototype.indexOf) {
    indexOf = Array.prototype.indexOf
  } else {
    indexOf = function (o) {
      // I know
      var i
      for (i = 0; i < this.length; ++i) {
        if (this[i] === o) {
          return i
        }
      }
      return -1
    }
  }

  function daysInMonth(year, month) {
    if (isNaN(year) || isNaN(month)) {
      return NaN
    }
    var modMonth = mod(month, 12)
    year += (month - modMonth) / 12
    return modMonth === 1 ? (isLeapYear(year) ? 29 : 28) : 31 - ((modMonth % 7) % 2)
  }

  // FORMATTING

  addFormatToken('M', ['MM', 2], 'Mo', function () {
    return this.month() + 1
  })

  addFormatToken('MMM', 0, 0, function (format) {
    return this.localeData().monthsShort(this, format)
  })

  addFormatToken('MMMM', 0, 0, function (format) {
    return this.localeData().months(this, format)
  })

  // ALIASES

  addUnitAlias('month', 'M')

  // PRIORITY

  addUnitPriority('month', 8)

  // PARSING

  addRegexToken('M', match1to2)
  addRegexToken('MM', match1to2, match2)
  addRegexToken('MMM', function (isStrict, locale) {
    return locale.monthsShortRegex(isStrict)
  })
  addRegexToken('MMMM', function (isStrict, locale) {
    return locale.monthsRegex(isStrict)
  })

  addParseToken(['M', 'MM'], function (input, array) {
    array[MONTH] = toInt(input) - 1
  })

  addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
    var month = config._locale.monthsParse(input, token, config._strict)
    // if we didn't find a month name, mark the date as invalid.
    if (month != null) {
      array[MONTH] = month
    } else {
      getParsingFlags(config).invalidMonth = input
    }
  })

  // LOCALES

  var MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/
  var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_')
  function localeMonths(m, format) {
    if (!m) {
      return isArray(this._months) ? this._months : this._months['standalone']
    }
    return isArray(this._months)
      ? this._months[m.month()]
      : this._months[(this._months.isFormat || MONTHS_IN_FORMAT).test(format) ? 'format' : 'standalone'][m.month()]
  }

  var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_')
  function localeMonthsShort(m, format) {
    if (!m) {
      return isArray(this._monthsShort) ? this._monthsShort : this._monthsShort['standalone']
    }
    return isArray(this._monthsShort) ? this._monthsShort[m.month()] : this._monthsShort[MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'][m.month()]
  }

  function handleStrictParse(monthName, format, strict) {
    var i,
      ii,
      mom,
      llc = monthName.toLocaleLowerCase()
    if (!this._monthsParse) {
      // this is not used
      this._monthsParse = []
      this._longMonthsParse = []
      this._shortMonthsParse = []
      for (i = 0; i < 12; ++i) {
        mom = createUTC([2000, i])
        this._shortMonthsParse[i] = this.monthsShort(mom, '').toLocaleLowerCase()
        this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase()
      }
    }

    if (strict) {
      if (format === 'MMM') {
        ii = indexOf.call(this._shortMonthsParse, llc)
        return ii !== -1 ? ii : null
      } else {
        ii = indexOf.call(this._longMonthsParse, llc)
        return ii !== -1 ? ii : null
      }
    } else {
      if (format === 'MMM') {
        ii = indexOf.call(this._shortMonthsParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._longMonthsParse, llc)
        return ii !== -1 ? ii : null
      } else {
        ii = indexOf.call(this._longMonthsParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._shortMonthsParse, llc)
        return ii !== -1 ? ii : null
      }
    }
  }

  function localeMonthsParse(monthName, format, strict) {
    var i, mom, regex

    if (this._monthsParseExact) {
      return handleStrictParse.call(this, monthName, format, strict)
    }

    if (!this._monthsParse) {
      this._monthsParse = []
      this._longMonthsParse = []
      this._shortMonthsParse = []
    }

    // TODO: add sorting
    // Sorting makes sure if one month (or abbr) is a prefix of another
    // see sorting in computeMonthsParse
    for (i = 0; i < 12; i++) {
      // make the regex if we don't have it already
      mom = createUTC([2000, i])
      if (strict && !this._longMonthsParse[i]) {
        this._longMonthsParse[i] = new RegExp('^' + this.months(mom, '').replace('.', '') + '$', 'i')
        this._shortMonthsParse[i] = new RegExp('^' + this.monthsShort(mom, '').replace('.', '') + '$', 'i')
      }
      if (!strict && !this._monthsParse[i]) {
        regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '')
        this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i')
      }
      // test the regex
      if (strict && format === 'MMMM' && this._longMonthsParse[i].test(monthName)) {
        return i
      } else if (strict && format === 'MMM' && this._shortMonthsParse[i].test(monthName)) {
        return i
      } else if (!strict && this._monthsParse[i].test(monthName)) {
        return i
      }
    }
  }

  // MOMENTS

  function setMonth(mom, value) {
    var dayOfMonth

    if (!mom.isValid()) {
      // No op
      return mom
    }

    if (typeof value === 'string') {
      if (/^\d+$/.test(value)) {
        value = toInt(value)
      } else {
        value = mom.localeData().monthsParse(value)
        // TODO: Another silent failure?
        if (!isNumber(value)) {
          return mom
        }
      }
    }

    dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value))
    mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth)
    return mom
  }

  function getSetMonth(value) {
    if (value != null) {
      setMonth(this, value)
      hooks.updateOffset(this, true)
      return this
    } else {
      return get(this, 'Month')
    }
  }

  function getDaysInMonth() {
    return daysInMonth(this.year(), this.month())
  }

  var defaultMonthsShortRegex = matchWord
  function monthsShortRegex(isStrict) {
    if (this._monthsParseExact) {
      if (!hasOwnProp(this, '_monthsRegex')) {
        computeMonthsParse.call(this)
      }
      if (isStrict) {
        return this._monthsShortStrictRegex
      } else {
        return this._monthsShortRegex
      }
    } else {
      if (!hasOwnProp(this, '_monthsShortRegex')) {
        this._monthsShortRegex = defaultMonthsShortRegex
      }
      return this._monthsShortStrictRegex && isStrict ? this._monthsShortStrictRegex : this._monthsShortRegex
    }
  }

  var defaultMonthsRegex = matchWord
  function monthsRegex(isStrict) {
    if (this._monthsParseExact) {
      if (!hasOwnProp(this, '_monthsRegex')) {
        computeMonthsParse.call(this)
      }
      if (isStrict) {
        return this._monthsStrictRegex
      } else {
        return this._monthsRegex
      }
    } else {
      if (!hasOwnProp(this, '_monthsRegex')) {
        this._monthsRegex = defaultMonthsRegex
      }
      return this._monthsStrictRegex && isStrict ? this._monthsStrictRegex : this._monthsRegex
    }
  }

  function computeMonthsParse() {
    function cmpLenRev(a, b) {
      return b.length - a.length
    }

    var shortPieces = [],
      longPieces = [],
      mixedPieces = [],
      i,
      mom
    for (i = 0; i < 12; i++) {
      // make the regex if we don't have it already
      mom = createUTC([2000, i])
      shortPieces.push(this.monthsShort(mom, ''))
      longPieces.push(this.months(mom, ''))
      mixedPieces.push(this.months(mom, ''))
      mixedPieces.push(this.monthsShort(mom, ''))
    }
    // Sorting makes sure if one month (or abbr) is a prefix of another it
    // will match the longer piece.
    shortPieces.sort(cmpLenRev)
    longPieces.sort(cmpLenRev)
    mixedPieces.sort(cmpLenRev)
    for (i = 0; i < 12; i++) {
      shortPieces[i] = regexEscape(shortPieces[i])
      longPieces[i] = regexEscape(longPieces[i])
    }
    for (i = 0; i < 24; i++) {
      mixedPieces[i] = regexEscape(mixedPieces[i])
    }

    this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i')
    this._monthsShortRegex = this._monthsRegex
    this._monthsStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i')
    this._monthsShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i')
  }

  function createDate(y, m, d, h, M, s, ms) {
    // can't just apply() to create a date:
    // https://stackoverflow.com/q/181348
    var date
    // the date constructor remaps years 0-99 to 1900-1999
    if (y < 100 && y >= 0) {
      // preserve leap years using a full 400 year cycle, then reset
      date = new Date(y + 400, m, d, h, M, s, ms)
      if (isFinite(date.getFullYear())) {
        date.setFullYear(y)
      }
    } else {
      date = new Date(y, m, d, h, M, s, ms)
    }

    return date
  }

  function createUTCDate(y) {
    var date
    // the Date.UTC function remaps years 0-99 to 1900-1999
    if (y < 100 && y >= 0) {
      var args = Array.prototype.slice.call(arguments)
      // preserve leap years using a full 400 year cycle, then reset
      args[0] = y + 400
      date = new Date(Date.UTC.apply(null, args))
      if (isFinite(date.getUTCFullYear())) {
        date.setUTCFullYear(y)
      }
    } else {
      date = new Date(Date.UTC.apply(null, arguments))
    }

    return date
  }

  // start-of-first-week - start-of-year
  function firstWeekOffset(year, dow, doy) {
    var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
      fwd = 7 + dow - doy,
      // first-week day local weekday -- which local weekday is fwd
      fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7

    return -fwdlw + fwd - 1
  }

  // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
  function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
    var localWeekday = (7 + weekday - dow) % 7,
      weekOffset = firstWeekOffset(year, dow, doy),
      dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
      resYear,
      resDayOfYear

    if (dayOfYear <= 0) {
      resYear = year - 1
      resDayOfYear = daysInYear(resYear) + dayOfYear
    } else if (dayOfYear > daysInYear(year)) {
      resYear = year + 1
      resDayOfYear = dayOfYear - daysInYear(year)
    } else {
      resYear = year
      resDayOfYear = dayOfYear
    }

    return {
      year: resYear,
      dayOfYear: resDayOfYear,
    }
  }

  function weekOfYear(mom, dow, doy) {
    var weekOffset = firstWeekOffset(mom.year(), dow, doy),
      week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
      resWeek,
      resYear

    if (week < 1) {
      resYear = mom.year() - 1
      resWeek = week + weeksInYear(resYear, dow, doy)
    } else if (week > weeksInYear(mom.year(), dow, doy)) {
      resWeek = week - weeksInYear(mom.year(), dow, doy)
      resYear = mom.year() + 1
    } else {
      resYear = mom.year()
      resWeek = week
    }

    return {
      week: resWeek,
      year: resYear,
    }
  }

  function weeksInYear(year, dow, doy) {
    var weekOffset = firstWeekOffset(year, dow, doy),
      weekOffsetNext = firstWeekOffset(year + 1, dow, doy)
    return (daysInYear(year) - weekOffset + weekOffsetNext) / 7
  }

  // FORMATTING

  addFormatToken('w', ['ww', 2], 'wo', 'week')
  addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek')

  // ALIASES

  addUnitAlias('week', 'w')
  addUnitAlias('isoWeek', 'W')

  // PRIORITIES

  addUnitPriority('week', 5)
  addUnitPriority('isoWeek', 5)

  // PARSING

  addRegexToken('w', match1to2)
  addRegexToken('ww', match1to2, match2)
  addRegexToken('W', match1to2)
  addRegexToken('WW', match1to2, match2)

  addWeekParseToken(['w', 'ww', 'W', 'WW'], function (input, week, config, token) {
    week[token.substr(0, 1)] = toInt(input)
  })

  // HELPERS

  // LOCALES

  function localeWeek(mom) {
    return weekOfYear(mom, this._week.dow, this._week.doy).week
  }

  var defaultLocaleWeek = {
    dow: 0, // Sunday is the first day of the week.
    doy: 6, // The week that contains Jan 6th is the first week of the year.
  }

  function localeFirstDayOfWeek() {
    return this._week.dow
  }

  function localeFirstDayOfYear() {
    return this._week.doy
  }

  // MOMENTS

  function getSetWeek(input) {
    var week = this.localeData().week(this)
    return input == null ? week : this.add((input - week) * 7, 'd')
  }

  function getSetISOWeek(input) {
    var week = weekOfYear(this, 1, 4).week
    return input == null ? week : this.add((input - week) * 7, 'd')
  }

  // FORMATTING

  addFormatToken('d', 0, 'do', 'day')

  addFormatToken('dd', 0, 0, function (format) {
    return this.localeData().weekdaysMin(this, format)
  })

  addFormatToken('ddd', 0, 0, function (format) {
    return this.localeData().weekdaysShort(this, format)
  })

  addFormatToken('dddd', 0, 0, function (format) {
    return this.localeData().weekdays(this, format)
  })

  addFormatToken('e', 0, 0, 'weekday')
  addFormatToken('E', 0, 0, 'isoWeekday')

  // ALIASES

  addUnitAlias('day', 'd')
  addUnitAlias('weekday', 'e')
  addUnitAlias('isoWeekday', 'E')

  // PRIORITY
  addUnitPriority('day', 11)
  addUnitPriority('weekday', 11)
  addUnitPriority('isoWeekday', 11)

  // PARSING

  addRegexToken('d', match1to2)
  addRegexToken('e', match1to2)
  addRegexToken('E', match1to2)
  addRegexToken('dd', function (isStrict, locale) {
    return locale.weekdaysMinRegex(isStrict)
  })
  addRegexToken('ddd', function (isStrict, locale) {
    return locale.weekdaysShortRegex(isStrict)
  })
  addRegexToken('dddd', function (isStrict, locale) {
    return locale.weekdaysRegex(isStrict)
  })

  addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
    var weekday = config._locale.weekdaysParse(input, token, config._strict)
    // if we didn't get a weekday name, mark the date as invalid
    if (weekday != null) {
      week.d = weekday
    } else {
      getParsingFlags(config).invalidWeekday = input
    }
  })

  addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
    week[token] = toInt(input)
  })

  // HELPERS

  function parseWeekday(input, locale) {
    if (typeof input !== 'string') {
      return input
    }

    if (!isNaN(input)) {
      return parseInt(input, 10)
    }

    input = locale.weekdaysParse(input)
    if (typeof input === 'number') {
      return input
    }

    return null
  }

  function parseIsoWeekday(input, locale) {
    if (typeof input === 'string') {
      return locale.weekdaysParse(input) % 7 || 7
    }
    return isNaN(input) ? null : input
  }

  // LOCALES
  function shiftWeekdays(ws, n) {
    return ws.slice(n, 7).concat(ws.slice(0, n))
  }

  var defaultLocaleWeekdays = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_')
  function localeWeekdays(m, format) {
    var weekdays = isArray(this._weekdays) ? this._weekdays : this._weekdays[m && m !== true && this._weekdays.isFormat.test(format) ? 'format' : 'standalone']
    return m === true ? shiftWeekdays(weekdays, this._week.dow) : m ? weekdays[m.day()] : weekdays
  }

  var defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_')
  function localeWeekdaysShort(m) {
    return m === true ? shiftWeekdays(this._weekdaysShort, this._week.dow) : m ? this._weekdaysShort[m.day()] : this._weekdaysShort
  }

  var defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_')
  function localeWeekdaysMin(m) {
    return m === true ? shiftWeekdays(this._weekdaysMin, this._week.dow) : m ? this._weekdaysMin[m.day()] : this._weekdaysMin
  }

  function handleStrictParse$1(weekdayName, format, strict) {
    var i,
      ii,
      mom,
      llc = weekdayName.toLocaleLowerCase()
    if (!this._weekdaysParse) {
      this._weekdaysParse = []
      this._shortWeekdaysParse = []
      this._minWeekdaysParse = []

      for (i = 0; i < 7; ++i) {
        mom = createUTC([2000, 1]).day(i)
        this._minWeekdaysParse[i] = this.weekdaysMin(mom, '').toLocaleLowerCase()
        this._shortWeekdaysParse[i] = this.weekdaysShort(mom, '').toLocaleLowerCase()
        this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase()
      }
    }

    if (strict) {
      if (format === 'dddd') {
        ii = indexOf.call(this._weekdaysParse, llc)
        return ii !== -1 ? ii : null
      } else if (format === 'ddd') {
        ii = indexOf.call(this._shortWeekdaysParse, llc)
        return ii !== -1 ? ii : null
      } else {
        ii = indexOf.call(this._minWeekdaysParse, llc)
        return ii !== -1 ? ii : null
      }
    } else {
      if (format === 'dddd') {
        ii = indexOf.call(this._weekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._shortWeekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._minWeekdaysParse, llc)
        return ii !== -1 ? ii : null
      } else if (format === 'ddd') {
        ii = indexOf.call(this._shortWeekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._weekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._minWeekdaysParse, llc)
        return ii !== -1 ? ii : null
      } else {
        ii = indexOf.call(this._minWeekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._weekdaysParse, llc)
        if (ii !== -1) {
          return ii
        }
        ii = indexOf.call(this._shortWeekdaysParse, llc)
        return ii !== -1 ? ii : null
      }
    }
  }

  function localeWeekdaysParse(weekdayName, format, strict) {
    var i, mom, regex

    if (this._weekdaysParseExact) {
      return handleStrictParse$1.call(this, weekdayName, format, strict)
    }

    if (!this._weekdaysParse) {
      this._weekdaysParse = []
      this._minWeekdaysParse = []
      this._shortWeekdaysParse = []
      this._fullWeekdaysParse = []
    }

    for (i = 0; i < 7; i++) {
      // make the regex if we don't have it already

      mom = createUTC([2000, 1]).day(i)
      if (strict && !this._fullWeekdaysParse[i]) {
        this._fullWeekdaysParse[i] = new RegExp('^' + this.weekdays(mom, '').replace('.', '\\.?') + '$', 'i')
        this._shortWeekdaysParse[i] = new RegExp('^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$', 'i')
        this._minWeekdaysParse[i] = new RegExp('^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$', 'i')
      }
      if (!this._weekdaysParse[i]) {
        regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '')
        this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i')
      }
      // test the regex
      if (strict && format === 'dddd' && this._fullWeekdaysParse[i].test(weekdayName)) {
        return i
      } else if (strict && format === 'ddd' && this._shortWeekdaysParse[i].test(weekdayName)) {
        return i
      } else if (strict && format === 'dd' && this._minWeekdaysParse[i].test(weekdayName)) {
        return i
      } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
        return i
      }
    }
  }

  // MOMENTS

  function getSetDayOfWeek(input) {
    if (!this.isValid()) {
      return input != null ? this : NaN
    }
    var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay()
    if (input != null) {
      input = parseWeekday(input, this.localeData())
      return this.add(input - day, 'd')
    } else {
      return day
    }
  }

  function getSetLocaleDayOfWeek(input) {
    if (!this.isValid()) {
      return input != null ? this : NaN
    }
    var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7
    return input == null ? weekday : this.add(input - weekday, 'd')
  }

  function getSetISODayOfWeek(input) {
    if (!this.isValid()) {
      return input != null ? this : NaN
    }

    // behaves the same as moment#day except
    // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
    // as a setter, sunday should belong to the previous week.

    if (input != null) {
      var weekday = parseIsoWeekday(input, this.localeData())
      return this.day(this.day() % 7 ? weekday : weekday - 7)
    } else {
      return this.day() || 7
    }
  }

  var defaultWeekdaysRegex = matchWord
  function weekdaysRegex(isStrict) {
    if (this._weekdaysParseExact) {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        computeWeekdaysParse.call(this)
      }
      if (isStrict) {
        return this._weekdaysStrictRegex
      } else {
        return this._weekdaysRegex
      }
    } else {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        this._weekdaysRegex = defaultWeekdaysRegex
      }
      return this._weekdaysStrictRegex && isStrict ? this._weekdaysStrictRegex : this._weekdaysRegex
    }
  }

  var defaultWeekdaysShortRegex = matchWord
  function weekdaysShortRegex(isStrict) {
    if (this._weekdaysParseExact) {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        computeWeekdaysParse.call(this)
      }
      if (isStrict) {
        return this._weekdaysShortStrictRegex
      } else {
        return this._weekdaysShortRegex
      }
    } else {
      if (!hasOwnProp(this, '_weekdaysShortRegex')) {
        this._weekdaysShortRegex = defaultWeekdaysShortRegex
      }
      return this._weekdaysShortStrictRegex && isStrict ? this._weekdaysShortStrictRegex : this._weekdaysShortRegex
    }
  }

  var defaultWeekdaysMinRegex = matchWord
  function weekdaysMinRegex(isStrict) {
    if (this._weekdaysParseExact) {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        computeWeekdaysParse.call(this)
      }
      if (isStrict) {
        return this._weekdaysMinStrictRegex
      } else {
        return this._weekdaysMinRegex
      }
    } else {
      if (!hasOwnProp(this, '_weekdaysMinRegex')) {
        this._weekdaysMinRegex = defaultWeekdaysMinRegex
      }
      return this._weekdaysMinStrictRegex && isStrict ? this._weekdaysMinStrictRegex : this._weekdaysMinRegex
    }
  }

  function computeWeekdaysParse() {
    function cmpLenRev(a, b) {
      return b.length - a.length
    }

    var minPieces = [],
      shortPieces = [],
      longPieces = [],
      mixedPieces = [],
      i,
      mom,
      minp,
      shortp,
      longp
    for (i = 0; i < 7; i++) {
      // make the regex if we don't have it already
      mom = createUTC([2000, 1]).day(i)
      minp = this.weekdaysMin(mom, '')
      shortp = this.weekdaysShort(mom, '')
      longp = this.weekdays(mom, '')
      minPieces.push(minp)
      shortPieces.push(shortp)
      longPieces.push(longp)
      mixedPieces.push(minp)
      mixedPieces.push(shortp)
      mixedPieces.push(longp)
    }
    // Sorting makes sure if one weekday (or abbr) is a prefix of another it
    // will match the longer piece.
    minPieces.sort(cmpLenRev)
    shortPieces.sort(cmpLenRev)
    longPieces.sort(cmpLenRev)
    mixedPieces.sort(cmpLenRev)
    for (i = 0; i < 7; i++) {
      shortPieces[i] = regexEscape(shortPieces[i])
      longPieces[i] = regexEscape(longPieces[i])
      mixedPieces[i] = regexEscape(mixedPieces[i])
    }

    this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i')
    this._weekdaysShortRegex = this._weekdaysRegex
    this._weekdaysMinRegex = this._weekdaysRegex

    this._weekdaysStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i')
    this._weekdaysShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i')
    this._weekdaysMinStrictRegex = new RegExp('^(' + minPieces.join('|') + ')', 'i')
  }

  // FORMATTING

  function hFormat() {
    return this.hours() % 12 || 12
  }

  function kFormat() {
    return this.hours() || 24
  }

  addFormatToken('H', ['HH', 2], 0, 'hour')
  addFormatToken('h', ['hh', 2], 0, hFormat)
  addFormatToken('k', ['kk', 2], 0, kFormat)

  addFormatToken('hmm', 0, 0, function () {
    return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2)
  })

  addFormatToken('hmmss', 0, 0, function () {
    return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2)
  })

  addFormatToken('Hmm', 0, 0, function () {
    return '' + this.hours() + zeroFill(this.minutes(), 2)
  })

  addFormatToken('Hmmss', 0, 0, function () {
    return '' + this.hours() + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2)
  })

  function meridiem(token, lowercase) {
    addFormatToken(token, 0, 0, function () {
      return this.localeData().meridiem(this.hours(), this.minutes(), lowercase)
    })
  }

  meridiem('a', true)
  meridiem('A', false)

  // ALIASES

  addUnitAlias('hour', 'h')

  // PRIORITY
  addUnitPriority('hour', 13)

  // PARSING

  function matchMeridiem(isStrict, locale) {
    return locale._meridiemParse
  }

  addRegexToken('a', matchMeridiem)
  addRegexToken('A', matchMeridiem)
  addRegexToken('H', match1to2)
  addRegexToken('h', match1to2)
  addRegexToken('k', match1to2)
  addRegexToken('HH', match1to2, match2)
  addRegexToken('hh', match1to2, match2)
  addRegexToken('kk', match1to2, match2)

  addRegexToken('hmm', match3to4)
  addRegexToken('hmmss', match5to6)
  addRegexToken('Hmm', match3to4)
  addRegexToken('Hmmss', match5to6)

  addParseToken(['H', 'HH'], HOUR)
  addParseToken(['k', 'kk'], function (input, array, config) {
    var kInput = toInt(input)
    array[HOUR] = kInput === 24 ? 0 : kInput
  })
  addParseToken(['a', 'A'], function (input, array, config) {
    config._isPm = config._locale.isPM(input)
    config._meridiem = input
  })
  addParseToken(['h', 'hh'], function (input, array, config) {
    array[HOUR] = toInt(input)
    getParsingFlags(config).bigHour = true
  })
  addParseToken('hmm', function (input, array, config) {
    var pos = input.length - 2
    array[HOUR] = toInt(input.substr(0, pos))
    array[MINUTE] = toInt(input.substr(pos))
    getParsingFlags(config).bigHour = true
  })
  addParseToken('hmmss', function (input, array, config) {
    var pos1 = input.length - 4
    var pos2 = input.length - 2
    array[HOUR] = toInt(input.substr(0, pos1))
    array[MINUTE] = toInt(input.substr(pos1, 2))
    array[SECOND] = toInt(input.substr(pos2))
    getParsingFlags(config).bigHour = true
  })
  addParseToken('Hmm', function (input, array, config) {
    var pos = input.length - 2
    array[HOUR] = toInt(input.substr(0, pos))
    array[MINUTE] = toInt(input.substr(pos))
  })
  addParseToken('Hmmss', function (input, array, config) {
    var pos1 = input.length - 4
    var pos2 = input.length - 2
    array[HOUR] = toInt(input.substr(0, pos1))
    array[MINUTE] = toInt(input.substr(pos1, 2))
    array[SECOND] = toInt(input.substr(pos2))
  })

  // LOCALES

  function localeIsPM(input) {
    // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
    // Using charAt should be more compatible.
    return (input + '').toLowerCase().charAt(0) === 'p'
  }

  var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i
  function localeMeridiem(hours, minutes, isLower) {
    if (hours > 11) {
      return isLower ? 'pm' : 'PM'
    } else {
      return isLower ? 'am' : 'AM'
    }
  }

  // MOMENTS

  // Setting the hour should keep the time, because the user explicitly
  // specified which hour they want. So trying to maintain the same hour (in
  // a new timezone) makes sense. Adding/subtracting hours does not follow
  // this rule.
  var getSetHour = makeGetSet('Hours', true)

  var baseConfig = {
    calendar: defaultCalendar,
    longDateFormat: defaultLongDateFormat,
    invalidDate: defaultInvalidDate,
    ordinal: defaultOrdinal,
    dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
    relativeTime: defaultRelativeTime,

    months: defaultLocaleMonths,
    monthsShort: defaultLocaleMonthsShort,

    week: defaultLocaleWeek,

    weekdays: defaultLocaleWeekdays,
    weekdaysMin: defaultLocaleWeekdaysMin,
    weekdaysShort: defaultLocaleWeekdaysShort,

    meridiemParse: defaultLocaleMeridiemParse,
  }

  // internal storage for locale config files
  var locales = {}
  var localeFamilies = {}
  var globalLocale

  function normalizeLocale(key) {
    return key ? key.toLowerCase().replace('_', '-') : key
  }

  // pick the locale from the array
  // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
  // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
  function chooseLocale(names) {
    var i = 0,
      j,
      next,
      locale,
      split

    while (i < names.length) {
      split = normalizeLocale(names[i]).split('-')
      j = split.length
      next = normalizeLocale(names[i + 1])
      next = next ? next.split('-') : null
      while (j > 0) {
        locale = loadLocale(split.slice(0, j).join('-'))
        if (locale) {
          return locale
        }
        if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
          //the next array item is better than a shallower substring of this one
          break
        }
        j--
      }
      i++
    }
    return globalLocale
  }

  function loadLocale(name) {
    var oldLocale = null
    // TODO: Find a better way to register and load all the locales in Node
    if (!locales[name] && typeof module !== 'undefined' && module && module.exports) {
      try {
        oldLocale = globalLocale._abbr
        var aliasedRequire = require
        aliasedRequire('./locale/' + name)
        getSetGlobalLocale(oldLocale)
      } catch (e) {}
    }
    return locales[name]
  }

  // This function will load locale and then set the global locale.  If
  // no arguments are passed in, it will simply return the current global
  // locale key.
  function getSetGlobalLocale(key, values) {
    var data
    if (key) {
      if (isUndefined(values)) {
        data = getLocale(key)
      } else {
        data = defineLocale(key, values)
      }

      if (data) {
        // moment.duration._locale = moment._locale = data;
        globalLocale = data
      } else {
        if (typeof console !== 'undefined' && console.warn) {
          //warn user if arguments are passed but the locale could not be set
          console.warn('Locale ' + key + ' not found. Did you forget to load it?')
        }
      }
    }

    return globalLocale._abbr
  }

  function defineLocale(name, config) {
    if (config !== null) {
      var locale,
        parentConfig = baseConfig
      config.abbr = name
      if (locales[name] != null) {
        deprecateSimple(
          'defineLocaleOverride',
          'use moment.updateLocale(localeName, config) to change ' +
            'an existing locale. moment.defineLocale(localeName, ' +
            'config) should only be used for creating a new locale ' +
            'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.',
        )
        parentConfig = locales[name]._config
      } else if (config.parentLocale != null) {
        if (locales[config.parentLocale] != null) {
          parentConfig = locales[config.parentLocale]._config
        } else {
          locale = loadLocale(config.parentLocale)
          if (locale != null) {
            parentConfig = locale._config
          } else {
            if (!localeFamilies[config.parentLocale]) {
              localeFamilies[config.parentLocale] = []
            }
            localeFamilies[config.parentLocale].push({
              name: name,
              config: config,
            })
            return null
          }
        }
      }
      locales[name] = new Locale(mergeConfigs(parentConfig, config))

      if (localeFamilies[name]) {
        localeFamilies[name].forEach(function (x) {
          defineLocale(x.name, x.config)
        })
      }

      // backwards compat for now: also set the locale
      // make sure we set the locale AFTER all child locales have been
      // created, so we won't end up with the child locale set.
      getSetGlobalLocale(name)

      return locales[name]
    } else {
      // useful for testing
      delete locales[name]
      return null
    }
  }

  function updateLocale(name, config) {
    if (config != null) {
      var locale,
        tmpLocale,
        parentConfig = baseConfig
      // MERGE
      tmpLocale = loadLocale(name)
      if (tmpLocale != null) {
        parentConfig = tmpLocale._config
      }
      config = mergeConfigs(parentConfig, config)
      locale = new Locale(config)
      locale.parentLocale = locales[name]
      locales[name] = locale

      // backwards compat for now: also set the locale
      getSetGlobalLocale(name)
    } else {
      // pass null for config to unupdate, useful for tests
      if (locales[name] != null) {
        if (locales[name].parentLocale != null) {
          locales[name] = locales[name].parentLocale
        } else if (locales[name] != null) {
          delete locales[name]
        }
      }
    }
    return locales[name]
  }

  // returns locale data
  function getLocale(key) {
    var locale

    if (key && key._locale && key._locale._abbr) {
      key = key._locale._abbr
    }

    if (!key) {
      return globalLocale
    }

    if (!isArray(key)) {
      //short-circuit everything else
      locale = loadLocale(key)
      if (locale) {
        return locale
      }
      key = [key]
    }

    return chooseLocale(key)
  }

  function listLocales() {
    return keys(locales)
  }

  function checkOverflow(m) {
    var overflow
    var a = m._a

    if (a && getParsingFlags(m).overflow === -2) {
      overflow =
        a[MONTH] < 0 || a[MONTH] > 11
          ? MONTH
          : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH])
          ? DATE
          : a[HOUR] < 0 || a[HOUR] > 24 || (a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0))
          ? HOUR
          : a[MINUTE] < 0 || a[MINUTE] > 59
          ? MINUTE
          : a[SECOND] < 0 || a[SECOND] > 59
          ? SECOND
          : a[MILLISECOND] < 0 || a[MILLISECOND] > 999
          ? MILLISECOND
          : -1

      if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
        overflow = DATE
      }
      if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
        overflow = WEEK
      }
      if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
        overflow = WEEKDAY
      }

      getParsingFlags(m).overflow = overflow
    }

    return m
  }

  // Pick the first defined of two or three arguments.
  function defaults(a, b, c) {
    if (a != null) {
      return a
    }
    if (b != null) {
      return b
    }
    return c
  }

  function currentDateArray(config) {
    // hooks is actually the exported moment object
    var nowValue = new Date(hooks.now())
    if (config._useUTC) {
      return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()]
    }
    return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()]
  }

  // convert an array to a date.
  // the array should mirror the parameters below
  // note: all values past the year are optional and will default to the lowest possible value.
  // [year, month, day , hour, minute, second, millisecond]
  function configFromArray(config) {
    var i,
      date,
      input = [],
      currentDate,
      expectedWeekday,
      yearToUse

    if (config._d) {
      return
    }

    currentDate = currentDateArray(config)

    //compute day of the year from weeks and weekdays
    if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
      dayOfYearFromWeekInfo(config)
    }

    //if the day of the year is set, figure out what it is
    if (config._dayOfYear != null) {
      yearToUse = defaults(config._a[YEAR], currentDate[YEAR])

      if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
        getParsingFlags(config)._overflowDayOfYear = true
      }

      date = createUTCDate(yearToUse, 0, config._dayOfYear)
      config._a[MONTH] = date.getUTCMonth()
      config._a[DATE] = date.getUTCDate()
    }

    // Default to current date.
    // * if no year, month, day of month are given, default to today
    // * if day of month is given, default month and year
    // * if month is given, default only year
    // * if year is given, don't default anything
    for (i = 0; i < 3 && config._a[i] == null; ++i) {
      config._a[i] = input[i] = currentDate[i]
    }

    // Zero out whatever was not defaulted, including time
    for (; i < 7; i++) {
      config._a[i] = input[i] = config._a[i] == null ? (i === 2 ? 1 : 0) : config._a[i]
    }

    // Check for 24:00:00.000
    if (config._a[HOUR] === 24 && config._a[MINUTE] === 0 && config._a[SECOND] === 0 && config._a[MILLISECOND] === 0) {
      config._nextDay = true
      config._a[HOUR] = 0
    }

    config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input)
    expectedWeekday = config._useUTC ? config._d.getUTCDay() : config._d.getDay()

    // Apply timezone offset from input. The actual utcOffset can be changed
    // with parseZone.
    if (config._tzm != null) {
      config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm)
    }

    if (config._nextDay) {
      config._a[HOUR] = 24
    }

    // check for mismatching day of week
    if (config._w && typeof config._w.d !== 'undefined' && config._w.d !== expectedWeekday) {
      getParsingFlags(config).weekdayMismatch = true
    }
  }

  function dayOfYearFromWeekInfo(config) {
    var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow

    w = config._w
    if (w.GG != null || w.W != null || w.E != null) {
      dow = 1
      doy = 4

      // TODO: We need to take the current isoWeekYear, but that depends on
      // how we interpret now (local, utc, fixed offset). So create
      // a now version of current config (take local/utc/offset flags, and
      // create now).
      weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year)
      week = defaults(w.W, 1)
      weekday = defaults(w.E, 1)
      if (weekday < 1 || weekday > 7) {
        weekdayOverflow = true
      }
    } else {
      dow = config._locale._week.dow
      doy = config._locale._week.doy

      var curWeek = weekOfYear(createLocal(), dow, doy)

      weekYear = defaults(w.gg, config._a[YEAR], curWeek.year)

      // Default to current week.
      week = defaults(w.w, curWeek.week)

      if (w.d != null) {
        // weekday -- low day numbers are considered next week
        weekday = w.d
        if (weekday < 0 || weekday > 6) {
          weekdayOverflow = true
        }
      } else if (w.e != null) {
        // local weekday -- counting starts from beginning of week
        weekday = w.e + dow
        if (w.e < 0 || w.e > 6) {
          weekdayOverflow = true
        }
      } else {
        // default to beginning of week
        weekday = dow
      }
    }
    if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
      getParsingFlags(config)._overflowWeeks = true
    } else if (weekdayOverflow != null) {
      getParsingFlags(config)._overflowWeekday = true
    } else {
      temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy)
      config._a[YEAR] = temp.year
      config._dayOfYear = temp.dayOfYear
    }
  }

  // iso 8601 regex
  // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
  var extendedIsoRegex =
    /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/
  var basicIsoRegex =
    /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/

  var tzRegex = /Z|[+-]\d\d(?::?\d\d)?/

  var isoDates = [
    ['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/],
    ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/],
    ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/],
    ['GGGG-[W]WW', /\d{4}-W\d\d/, false],
    ['YYYY-DDD', /\d{4}-\d{3}/],
    ['YYYY-MM', /\d{4}-\d\d/, false],
    ['YYYYYYMMDD', /[+-]\d{10}/],
    ['YYYYMMDD', /\d{8}/],
    // YYYYMM is NOT allowed by the standard
    ['GGGG[W]WWE', /\d{4}W\d{3}/],
    ['GGGG[W]WW', /\d{4}W\d{2}/, false],
    ['YYYYDDD', /\d{7}/],
  ]

  // iso time formats and regexes
  var isoTimes = [
    ['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/],
    ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/],
    ['HH:mm:ss', /\d\d:\d\d:\d\d/],
    ['HH:mm', /\d\d:\d\d/],
    ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/],
    ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/],
    ['HHmmss', /\d\d\d\d\d\d/],
    ['HHmm', /\d\d\d\d/],
    ['HH', /\d\d/],
  ]

  var aspNetJsonRegex = /^\/?Date\((\-?\d+)/i

  // date from iso format
  function configFromISO(config) {
    var i,
      l,
      string = config._i,
      match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
      allowTime,
      dateFormat,
      timeFormat,
      tzFormat

    if (match) {
      getParsingFlags(config).iso = true

      for (i = 0, l = isoDates.length; i < l; i++) {
        if (isoDates[i][1].exec(match[1])) {
          dateFormat = isoDates[i][0]
          allowTime = isoDates[i][2] !== false
          break
        }
      }
      if (dateFormat == null) {
        config._isValid = false
        return
      }
      if (match[3]) {
        for (i = 0, l = isoTimes.length; i < l; i++) {
          if (isoTimes[i][1].exec(match[3])) {
            // match[2] should be 'T' or space
            timeFormat = (match[2] || ' ') + isoTimes[i][0]
            break
          }
        }
        if (timeFormat == null) {
          config._isValid = false
          return
        }
      }
      if (!allowTime && timeFormat != null) {
        config._isValid = false
        return
      }
      if (match[4]) {
        if (tzRegex.exec(match[4])) {
          tzFormat = 'Z'
        } else {
          config._isValid = false
          return
        }
      }
      config._f = dateFormat + (timeFormat || '') + (tzFormat || '')
      configFromStringAndFormat(config)
    } else {
      config._isValid = false
    }
  }

  // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3
  var rfc2822 =
    /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/

  function extractFromRFC2822Strings(yearStr, monthStr, dayStr, hourStr, minuteStr, secondStr) {
    var result = [untruncateYear(yearStr), defaultLocaleMonthsShort.indexOf(monthStr), parseInt(dayStr, 10), parseInt(hourStr, 10), parseInt(minuteStr, 10)]

    if (secondStr) {
      result.push(parseInt(secondStr, 10))
    }

    return result
  }

  function untruncateYear(yearStr) {
    var year = parseInt(yearStr, 10)
    if (year <= 49) {
      return 2000 + year
    } else if (year <= 999) {
      return 1900 + year
    }
    return year
  }

  function preprocessRFC2822(s) {
    // Remove comments and folding whitespace and replace multiple-spaces with a single space
    return s
      .replace(/\([^)]*\)|[\n\t]/g, ' ')
      .replace(/(\s\s+)/g, ' ')
      .replace(/^\s\s*/, '')
      .replace(/\s\s*$/, '')
  }

  function checkWeekday(weekdayStr, parsedInput, config) {
    if (weekdayStr) {
      // TODO: Replace the vanilla JS Date object with an indepentent day-of-week check.
      var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
        weekdayActual = new Date(parsedInput[0], parsedInput[1], parsedInput[2]).getDay()
      if (weekdayProvided !== weekdayActual) {
        getParsingFlags(config).weekdayMismatch = true
        config._isValid = false
        return false
      }
    }
    return true
  }

  var obsOffsets = {
    UT: 0,
    GMT: 0,
    EDT: -4 * 60,
    EST: -5 * 60,
    CDT: -5 * 60,
    CST: -6 * 60,
    MDT: -6 * 60,
    MST: -7 * 60,
    PDT: -7 * 60,
    PST: -8 * 60,
  }

  function calculateOffset(obsOffset, militaryOffset, numOffset) {
    if (obsOffset) {
      return obsOffsets[obsOffset]
    } else if (militaryOffset) {
      // the only allowed military tz is Z
      return 0
    } else {
      var hm = parseInt(numOffset, 10)
      var m = hm % 100,
        h = (hm - m) / 100
      return h * 60 + m
    }
  }

  // date and time from ref 2822 format
  function configFromRFC2822(config) {
    var match = rfc2822.exec(preprocessRFC2822(config._i))
    if (match) {
      var parsedArray = extractFromRFC2822Strings(match[4], match[3], match[2], match[5], match[6], match[7])
      if (!checkWeekday(match[1], parsedArray, config)) {
        return
      }

      config._a = parsedArray
      config._tzm = calculateOffset(match[8], match[9], match[10])

      config._d = createUTCDate.apply(null, config._a)
      config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm)

      getParsingFlags(config).rfc2822 = true
    } else {
      config._isValid = false
    }
  }

  // date from iso format or fallback
  function configFromString(config) {
    var matched = aspNetJsonRegex.exec(config._i)

    if (matched !== null) {
      config._d = new Date(+matched[1])
      return
    }

    configFromISO(config)
    if (config._isValid === false) {
      delete config._isValid
    } else {
      return
    }

    configFromRFC2822(config)
    if (config._isValid === false) {
      delete config._isValid
    } else {
      return
    }

    // Final attempt, use Input Fallback
    hooks.createFromInputFallback(config)
  }

  hooks.createFromInputFallback = deprecate(
    'value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' +
      'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' +
      'discouraged and will be removed in an upcoming major release. Please refer to ' +
      'http://momentjs.com/guides/#/warnings/js-date/ for more info.',
    function (config) {
      config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''))
    },
  )

  // constant that refers to the ISO standard
  hooks.ISO_8601 = function () {}

  // constant that refers to the RFC 2822 form
  hooks.RFC_2822 = function () {}

  // date from string and format string
  function configFromStringAndFormat(config) {
    // TODO: Move this to another part of the creation flow to prevent circular deps
    if (config._f === hooks.ISO_8601) {
      configFromISO(config)
      return
    }
    if (config._f === hooks.RFC_2822) {
      configFromRFC2822(config)
      return
    }
    config._a = []
    getParsingFlags(config).empty = true

    // This array is used to make a Date, either with `new Date` or `Date.UTC`
    var string = '' + config._i,
      i,
      parsedInput,
      tokens,
      token,
      skipped,
      stringLength = string.length,
      totalParsedInputLength = 0

    tokens = expandFormat(config._f, config._locale).match(formattingTokens) || []

    for (i = 0; i < tokens.length; i++) {
      token = tokens[i]
      parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0]
      // console.log('token', token, 'parsedInput', parsedInput,
      //         'regex', getParseRegexForToken(token, config));
      if (parsedInput) {
        skipped = string.substr(0, string.indexOf(parsedInput))
        if (skipped.length > 0) {
          getParsingFlags(config).unusedInput.push(skipped)
        }
        string = string.slice(string.indexOf(parsedInput) + parsedInput.length)
        totalParsedInputLength += parsedInput.length
      }
      // don't parse if it's not a known token
      if (formatTokenFunctions[token]) {
        if (parsedInput) {
          getParsingFlags(config).empty = false
        } else {
          getParsingFlags(config).unusedTokens.push(token)
        }
        addTimeToArrayFromToken(token, parsedInput, config)
      } else if (config._strict && !parsedInput) {
        getParsingFlags(config).unusedTokens.push(token)
      }
    }

    // add remaining unparsed input length to the string
    getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength
    if (string.length > 0) {
      getParsingFlags(config).unusedInput.push(string)
    }

    // clear _12h flag if hour is <= 12
    if (config._a[HOUR] <= 12 && getParsingFlags(config).bigHour === true && config._a[HOUR] > 0) {
      getParsingFlags(config).bigHour = undefined
    }

    getParsingFlags(config).parsedDateParts = config._a.slice(0)
    getParsingFlags(config).meridiem = config._meridiem
    // handle meridiem
    config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem)

    configFromArray(config)
    checkOverflow(config)
  }

  function meridiemFixWrap(locale, hour, meridiem) {
    var isPm

    if (meridiem == null) {
      // nothing to do
      return hour
    }
    if (locale.meridiemHour != null) {
      return locale.meridiemHour(hour, meridiem)
    } else if (locale.isPM != null) {
      // Fallback
      isPm = locale.isPM(meridiem)
      if (isPm && hour < 12) {
        hour += 12
      }
      if (!isPm && hour === 12) {
        hour = 0
      }
      return hour
    } else {
      // this is not supposed to happen
      return hour
    }
  }

  // date from string and array of format strings
  function configFromStringAndArray(config) {
    var tempConfig, bestMoment, scoreToBeat, i, currentScore

    if (config._f.length === 0) {
      getParsingFlags(config).invalidFormat = true
      config._d = new Date(NaN)
      return
    }

    for (i = 0; i < config._f.length; i++) {
      currentScore = 0
      tempConfig = copyConfig({}, config)
      if (config._useUTC != null) {
        tempConfig._useUTC = config._useUTC
      }
      tempConfig._f = config._f[i]
      configFromStringAndFormat(tempConfig)

      if (!isValid(tempConfig)) {
        continue
      }

      // if there is any input that was not parsed add a penalty for that format
      currentScore += getParsingFlags(tempConfig).charsLeftOver

      //or tokens
      currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10

      getParsingFlags(tempConfig).score = currentScore

      if (scoreToBeat == null || currentScore < scoreToBeat) {
        scoreToBeat = currentScore
        bestMoment = tempConfig
      }
    }

    extend(config, bestMoment || tempConfig)
  }

  function configFromObject(config) {
    if (config._d) {
      return
    }

    var i = normalizeObjectUnits(config._i)
    config._a = map([i.year, i.month, i.day || i.date, i.hour, i.minute, i.second, i.millisecond], function (obj) {
      return obj && parseInt(obj, 10)
    })

    configFromArray(config)
  }

  function createFromConfig(config) {
    var res = new Moment(checkOverflow(prepareConfig(config)))
    if (res._nextDay) {
      // Adding is smart enough around DST
      res.add(1, 'd')
      res._nextDay = undefined
    }

    return res
  }

  function prepareConfig(config) {
    var input = config._i,
      format = config._f

    config._locale = config._locale || getLocale(config._l)

    if (input === null || (format === undefined && input === '')) {
      return createInvalid({ nullInput: true })
    }

    if (typeof input === 'string') {
      config._i = input = config._locale.preparse(input)
    }

    if (isMoment(input)) {
      return new Moment(checkOverflow(input))
    } else if (isDate(input)) {
      config._d = input
    } else if (isArray(format)) {
      configFromStringAndArray(config)
    } else if (format) {
      configFromStringAndFormat(config)
    } else {
      configFromInput(config)
    }

    if (!isValid(config)) {
      config._d = null
    }

    return config
  }

  function configFromInput(config) {
    var input = config._i
    if (isUndefined(input)) {
      config._d = new Date(hooks.now())
    } else if (isDate(input)) {
      config._d = new Date(input.valueOf())
    } else if (typeof input === 'string') {
      configFromString(config)
    } else if (isArray(input)) {
      config._a = map(input.slice(0), function (obj) {
        return parseInt(obj, 10)
      })
      configFromArray(config)
    } else if (isObject(input)) {
      configFromObject(config)
    } else if (isNumber(input)) {
      // from milliseconds
      config._d = new Date(input)
    } else {
      hooks.createFromInputFallback(config)
    }
  }

  function createLocalOrUTC(input, format, locale, strict, isUTC) {
    var c = {}

    if (locale === true || locale === false) {
      strict = locale
      locale = undefined
    }

    if ((isObject(input) && isObjectEmpty(input)) || (isArray(input) && input.length === 0)) {
      input = undefined
    }
    // object construction must be done this way.
    // https://github.com/moment/moment/issues/1423
    c._isAMomentObject = true
    c._useUTC = c._isUTC = isUTC
    c._l = locale
    c._i = input
    c._f = format
    c._strict = strict

    return createFromConfig(c)
  }

  function createLocal(input, format, locale, strict) {
    return createLocalOrUTC(input, format, locale, strict, false)
  }

  var prototypeMin = deprecate('moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
    var other = createLocal.apply(null, arguments)
    if (this.isValid() && other.isValid()) {
      return other < this ? this : other
    } else {
      return createInvalid()
    }
  })

  var prototypeMax = deprecate('moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
    var other = createLocal.apply(null, arguments)
    if (this.isValid() && other.isValid()) {
      return other > this ? this : other
    } else {
      return createInvalid()
    }
  })

  // Pick a moment m from moments so that m[fn](other) is true for all
  // other. This relies on the function fn to be transitive.
  //
  // moments should either be an array of moment objects or an array, whose
  // first element is an array of moment objects.
  function pickBy(fn, moments) {
    var res, i
    if (moments.length === 1 && isArray(moments[0])) {
      moments = moments[0]
    }
    if (!moments.length) {
      return createLocal()
    }
    res = moments[0]
    for (i = 1; i < moments.length; ++i) {
      if (!moments[i].isValid() || moments[i][fn](res)) {
        res = moments[i]
      }
    }
    return res
  }

  // TODO: Use [].sort instead?
  function min() {
    var args = [].slice.call(arguments, 0)

    return pickBy('isBefore', args)
  }

  function max() {
    var args = [].slice.call(arguments, 0)

    return pickBy('isAfter', args)
  }

  var now = function () {
    return Date.now ? Date.now() : +new Date()
  }

  var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond']

  function isDurationValid(m) {
    for (var key in m) {
      if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
        return false
      }
    }

    var unitHasDecimal = false
    for (var i = 0; i < ordering.length; ++i) {
      if (m[ordering[i]]) {
        if (unitHasDecimal) {
          return false // only allow non-integers for smallest unit
        }
        if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
          unitHasDecimal = true
        }
      }
    }

    return true
  }

  function isValid$1() {
    return this._isValid
  }

  function createInvalid$1() {
    return createDuration(NaN)
  }

  function Duration(duration) {
    var normalizedInput = normalizeObjectUnits(duration),
      years = normalizedInput.year || 0,
      quarters = normalizedInput.quarter || 0,
      months = normalizedInput.month || 0,
      weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
      days = normalizedInput.day || 0,
      hours = normalizedInput.hour || 0,
      minutes = normalizedInput.minute || 0,
      seconds = normalizedInput.second || 0,
      milliseconds = normalizedInput.millisecond || 0

    this._isValid = isDurationValid(normalizedInput)

    // representation for dateAddRemove
    this._milliseconds =
      +milliseconds +
      seconds * 1e3 + // 1000
      minutes * 6e4 + // 1000 * 60
      hours * 1000 * 60 * 60 //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
    // Because of dateAddRemove treats 24 hours as different from a
    // day when working around DST, we need to store them separately
    this._days = +days + weeks * 7
    // It is impossible to translate months into days without knowing
    // which months you are are talking about, so we have to store
    // it separately.
    this._months = +months + quarters * 3 + years * 12

    this._data = {}

    this._locale = getLocale()

    this._bubble()
  }

  function isDuration(obj) {
    return obj instanceof Duration
  }

  function absRound(number) {
    if (number < 0) {
      return Math.round(-1 * number) * -1
    } else {
      return Math.round(number)
    }
  }

  // FORMATTING

  function offset(token, separator) {
    addFormatToken(token, 0, 0, function () {
      var offset = this.utcOffset()
      var sign = '+'
      if (offset < 0) {
        offset = -offset
        sign = '-'
      }
      return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~offset % 60, 2)
    })
  }

  offset('Z', ':')
  offset('ZZ', '')

  // PARSING

  addRegexToken('Z', matchShortOffset)
  addRegexToken('ZZ', matchShortOffset)
  addParseToken(['Z', 'ZZ'], function (input, array, config) {
    config._useUTC = true
    config._tzm = offsetFromString(matchShortOffset, input)
  })

  // HELPERS

  // timezone chunker
  // '+10:00' > ['10',  '00']
  // '-1530'  > ['-15', '30']
  var chunkOffset = /([\+\-]|\d\d)/gi

  function offsetFromString(matcher, string) {
    var matches = (string || '').match(matcher)

    if (matches === null) {
      return null
    }

    var chunk = matches[matches.length - 1] || []
    var parts = (chunk + '').match(chunkOffset) || ['-', 0, 0]
    var minutes = +(parts[1] * 60) + toInt(parts[2])

    return minutes === 0 ? 0 : parts[0] === '+' ? minutes : -minutes
  }

  // Return a moment from input, that is local/utc/zone equivalent to model.
  function cloneWithOffset(input, model) {
    var res, diff
    if (model._isUTC) {
      res = model.clone()
      diff = (isMoment(input) || isDate(input) ? input.valueOf() : createLocal(input).valueOf()) - res.valueOf()
      // Use low-level api, because this fn is low-level api.
      res._d.setTime(res._d.valueOf() + diff)
      hooks.updateOffset(res, false)
      return res
    } else {
      return createLocal(input).local()
    }
  }

  function getDateOffset(m) {
    // On Firefox.24 Date#getTimezoneOffset returns a floating point.
    // https://github.com/moment/moment/pull/1871
    return -Math.round(m._d.getTimezoneOffset() / 15) * 15
  }

  // HOOKS

  // This function will be called whenever a moment is mutated.
  // It is intended to keep the offset in sync with the timezone.
  hooks.updateOffset = function () {}

  // MOMENTS

  // keepLocalTime = true means only change the timezone, without
  // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
  // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
  // +0200, so we adjust the time as needed, to be valid.
  //
  // Keeping the time actually adds/subtracts (one hour)
  // from the actual represented time. That is why we call updateOffset
  // a second time. In case it wants us to change the offset again
  // _changeInProgress == true case, then we have to adjust, because
  // there is no such time in the given timezone.
  function getSetOffset(input, keepLocalTime, keepMinutes) {
    var offset = this._offset || 0,
      localAdjust
    if (!this.isValid()) {
      return input != null ? this : NaN
    }
    if (input != null) {
      if (typeof input === 'string') {
        input = offsetFromString(matchShortOffset, input)
        if (input === null) {
          return this
        }
      } else if (Math.abs(input) < 16 && !keepMinutes) {
        input = input * 60
      }
      if (!this._isUTC && keepLocalTime) {
        localAdjust = getDateOffset(this)
      }
      this._offset = input
      this._isUTC = true
      if (localAdjust != null) {
        this.add(localAdjust, 'm')
      }
      if (offset !== input) {
        if (!keepLocalTime || this._changeInProgress) {
          addSubtract(this, createDuration(input - offset, 'm'), 1, false)
        } else if (!this._changeInProgress) {
          this._changeInProgress = true
          hooks.updateOffset(this, true)
          this._changeInProgress = null
        }
      }
      return this
    } else {
      return this._isUTC ? offset : getDateOffset(this)
    }
  }

  function getSetZone(input, keepLocalTime) {
    if (input != null) {
      if (typeof input !== 'string') {
        input = -input
      }

      this.utcOffset(input, keepLocalTime)

      return this
    } else {
      return -this.utcOffset()
    }
  }

  function setOffsetToUTC(keepLocalTime) {
    return this.utcOffset(0, keepLocalTime)
  }

  function setOffsetToLocal(keepLocalTime) {
    if (this._isUTC) {
      this.utcOffset(0, keepLocalTime)
      this._isUTC = false

      if (keepLocalTime) {
        this.subtract(getDateOffset(this), 'm')
      }
    }
    return this
  }

  function setOffsetToParsedOffset() {
    if (this._tzm != null) {
      this.utcOffset(this._tzm, false, true)
    } else if (typeof this._i === 'string') {
      var tZone = offsetFromString(matchOffset, this._i)
      if (tZone != null) {
        this.utcOffset(tZone)
      } else {
        this.utcOffset(0, true)
      }
    }
    return this
  }

  function hasAlignedHourOffset(input) {
    if (!this.isValid()) {
      return false
    }
    input = input ? createLocal(input).utcOffset() : 0

    return (this.utcOffset() - input) % 60 === 0
  }

  function isDaylightSavingTime() {
    return this.utcOffset() > this.clone().month(0).utcOffset() || this.utcOffset() > this.clone().month(5).utcOffset()
  }

  function isDaylightSavingTimeShifted() {
    if (!isUndefined(this._isDSTShifted)) {
      return this._isDSTShifted
    }

    var c = {}

    copyConfig(c, this)
    c = prepareConfig(c)

    if (c._a) {
      var other = c._isUTC ? createUTC(c._a) : createLocal(c._a)
      this._isDSTShifted = this.isValid() && compareArrays(c._a, other.toArray()) > 0
    } else {
      this._isDSTShifted = false
    }

    return this._isDSTShifted
  }

  function isLocal() {
    return this.isValid() ? !this._isUTC : false
  }

  function isUtcOffset() {
    return this.isValid() ? this._isUTC : false
  }

  function isUtc() {
    return this.isValid() ? this._isUTC && this._offset === 0 : false
  }

  // ASP.NET json date format regex
  var aspNetRegex = /^(\-|\+)?(?:(\d*)[. ])?(\d+)\:(\d+)(?:\:(\d+)(\.\d*)?)?$/

  // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
  // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
  // and further modified to allow for strings containing both week and day
  var isoRegex =
    /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/

  function createDuration(input, key) {
    var duration = input,
      // matching against regexp is expensive, do it on demand
      match = null,
      sign,
      ret,
      diffRes

    if (isDuration(input)) {
      duration = {
        ms: input._milliseconds,
        d: input._days,
        M: input._months,
      }
    } else if (isNumber(input)) {
      duration = {}
      if (key) {
        duration[key] = input
      } else {
        duration.milliseconds = input
      }
    } else if (!!(match = aspNetRegex.exec(input))) {
      sign = match[1] === '-' ? -1 : 1
      duration = {
        y: 0,
        d: toInt(match[DATE]) * sign,
        h: toInt(match[HOUR]) * sign,
        m: toInt(match[MINUTE]) * sign,
        s: toInt(match[SECOND]) * sign,
        ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign, // the millisecond decimal point is included in the match
      }
    } else if (!!(match = isoRegex.exec(input))) {
      sign = match[1] === '-' ? -1 : 1
      duration = {
        y: parseIso(match[2], sign),
        M: parseIso(match[3], sign),
        w: parseIso(match[4], sign),
        d: parseIso(match[5], sign),
        h: parseIso(match[6], sign),
        m: parseIso(match[7], sign),
        s: parseIso(match[8], sign),
      }
    } else if (duration == null) {
      // checks for null or undefined
      duration = {}
    } else if (typeof duration === 'object' && ('from' in duration || 'to' in duration)) {
      diffRes = momentsDifference(createLocal(duration.from), createLocal(duration.to))

      duration = {}
      duration.ms = diffRes.milliseconds
      duration.M = diffRes.months
    }

    ret = new Duration(duration)

    if (isDuration(input) && hasOwnProp(input, '_locale')) {
      ret._locale = input._locale
    }

    return ret
  }

  createDuration.fn = Duration.prototype
  createDuration.invalid = createInvalid$1

  function parseIso(inp, sign) {
    // We'd normally use ~~inp for this, but unfortunately it also
    // converts floats to ints.
    // inp may be undefined, so careful calling replace on it.
    var res = inp && parseFloat(inp.replace(',', '.'))
    // apply sign while we're at it
    return (isNaN(res) ? 0 : res) * sign
  }

  function positiveMomentsDifference(base, other) {
    var res = {}

    res.months = other.month() - base.month() + (other.year() - base.year()) * 12
    if (base.clone().add(res.months, 'M').isAfter(other)) {
      --res.months
    }

    res.milliseconds = +other - +base.clone().add(res.months, 'M')

    return res
  }

  function momentsDifference(base, other) {
    var res
    if (!(base.isValid() && other.isValid())) {
      return { milliseconds: 0, months: 0 }
    }

    other = cloneWithOffset(other, base)
    if (base.isBefore(other)) {
      res = positiveMomentsDifference(base, other)
    } else {
      res = positiveMomentsDifference(other, base)
      res.milliseconds = -res.milliseconds
      res.months = -res.months
    }

    return res
  }

  // TODO: remove 'name' arg after deprecation is removed
  function createAdder(direction, name) {
    return function (val, period) {
      var dur, tmp
      //invert the arguments, but complain about it
      if (period !== null && !isNaN(+period)) {
        deprecateSimple(
          name,
          'moment().' +
            name +
            '(period, number) is deprecated. Please use moment().' +
            name +
            '(number, period). ' +
            'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.',
        )
        tmp = val
        val = period
        period = tmp
      }

      val = typeof val === 'string' ? +val : val
      dur = createDuration(val, period)
      addSubtract(this, dur, direction)
      return this
    }
  }

  function addSubtract(mom, duration, isAdding, updateOffset) {
    var milliseconds = duration._milliseconds,
      days = absRound(duration._days),
      months = absRound(duration._months)

    if (!mom.isValid()) {
      // No op
      return
    }

    updateOffset = updateOffset == null ? true : updateOffset

    if (months) {
      setMonth(mom, get(mom, 'Month') + months * isAdding)
    }
    if (days) {
      set$1(mom, 'Date', get(mom, 'Date') + days * isAdding)
    }
    if (milliseconds) {
      mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding)
    }
    if (updateOffset) {
      hooks.updateOffset(mom, days || months)
    }
  }

  var add = createAdder(1, 'add')
  var subtract = createAdder(-1, 'subtract')

  function getCalendarFormat(myMoment, now) {
    var diff = myMoment.diff(now, 'days', true)
    return diff < -6
      ? 'sameElse'
      : diff < -1
      ? 'lastWeek'
      : diff < 0
      ? 'lastDay'
      : diff < 1
      ? 'sameDay'
      : diff < 2
      ? 'nextDay'
      : diff < 7
      ? 'nextWeek'
      : 'sameElse'
  }

  function calendar$1(time, formats) {
    // We want to compare the start of today, vs this.
    // Getting start-of-today depends on whether we're local/utc/offset or not.
    var now = time || createLocal(),
      sod = cloneWithOffset(now, this).startOf('day'),
      format = hooks.calendarFormat(this, sod) || 'sameElse'

    var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format])

    return this.format(output || this.localeData().calendar(format, this, createLocal(now)))
  }

  function clone() {
    return new Moment(this)
  }

  function isAfter(input, units) {
    var localInput = isMoment(input) ? input : createLocal(input)
    if (!(this.isValid() && localInput.isValid())) {
      return false
    }
    units = normalizeUnits(units) || 'millisecond'
    if (units === 'millisecond') {
      return this.valueOf() > localInput.valueOf()
    } else {
      return localInput.valueOf() < this.clone().startOf(units).valueOf()
    }
  }

  function isBefore(input, units) {
    var localInput = isMoment(input) ? input : createLocal(input)
    if (!(this.isValid() && localInput.isValid())) {
      return false
    }
    units = normalizeUnits(units) || 'millisecond'
    if (units === 'millisecond') {
      return this.valueOf() < localInput.valueOf()
    } else {
      return this.clone().endOf(units).valueOf() < localInput.valueOf()
    }
  }

  function isBetween(from, to, units, inclusivity) {
    var localFrom = isMoment(from) ? from : createLocal(from),
      localTo = isMoment(to) ? to : createLocal(to)
    if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
      return false
    }
    inclusivity = inclusivity || '()'
    return (
      (inclusivity[0] === '(' ? this.isAfter(localFrom, units) : !this.isBefore(localFrom, units)) &&
      (inclusivity[1] === ')' ? this.isBefore(localTo, units) : !this.isAfter(localTo, units))
    )
  }

  function isSame(input, units) {
    var localInput = isMoment(input) ? input : createLocal(input),
      inputMs
    if (!(this.isValid() && localInput.isValid())) {
      return false
    }
    units = normalizeUnits(units) || 'millisecond'
    if (units === 'millisecond') {
      return this.valueOf() === localInput.valueOf()
    } else {
      inputMs = localInput.valueOf()
      return this.clone().startOf(units).valueOf() <= inputMs && inputMs <= this.clone().endOf(units).valueOf()
    }
  }

  function isSameOrAfter(input, units) {
    return this.isSame(input, units) || this.isAfter(input, units)
  }

  function isSameOrBefore(input, units) {
    return this.isSame(input, units) || this.isBefore(input, units)
  }

  function diff(input, units, asFloat) {
    var that, zoneDelta, output

    if (!this.isValid()) {
      return NaN
    }

    that = cloneWithOffset(input, this)

    if (!that.isValid()) {
      return NaN
    }

    zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4

    units = normalizeUnits(units)

    switch (units) {
      case 'year':
        output = monthDiff(this, that) / 12
        break
      case 'month':
        output = monthDiff(this, that)
        break
      case 'quarter':
        output = monthDiff(this, that) / 3
        break
      case 'second':
        output = (this - that) / 1e3
        break // 1000
      case 'minute':
        output = (this - that) / 6e4
        break // 1000 * 60
      case 'hour':
        output = (this - that) / 36e5
        break // 1000 * 60 * 60
      case 'day':
        output = (this - that - zoneDelta) / 864e5
        break // 1000 * 60 * 60 * 24, negate dst
      case 'week':
        output = (this - that - zoneDelta) / 6048e5
        break // 1000 * 60 * 60 * 24 * 7, negate dst
      default:
        output = this - that
    }

    return asFloat ? output : absFloor(output)
  }

  function monthDiff(a, b) {
    // difference in months
    var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
      // b is in (anchor - 1 month, anchor + 1 month)
      anchor = a.clone().add(wholeMonthDiff, 'months'),
      anchor2,
      adjust

    if (b - anchor < 0) {
      anchor2 = a.clone().add(wholeMonthDiff - 1, 'months')
      // linear across the month
      adjust = (b - anchor) / (anchor - anchor2)
    } else {
      anchor2 = a.clone().add(wholeMonthDiff + 1, 'months')
      // linear across the month
      adjust = (b - anchor) / (anchor2 - anchor)
    }

    //check for negative zero, return zero if negative zero
    return -(wholeMonthDiff + adjust) || 0
  }

  hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ'
  hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]'

  function toString() {
    return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ')
  }

  function toISOString(keepOffset) {
    if (!this.isValid()) {
      return null
    }
    var utc = keepOffset !== true
    var m = utc ? this.clone().utc() : this
    if (m.year() < 0 || m.year() > 9999) {
      return formatMoment(m, utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ')
    }
    if (isFunction(Date.prototype.toISOString)) {
      // native implementation is ~50x faster, use it when we can
      if (utc) {
        return this.toDate().toISOString()
      } else {
        return new Date(this.valueOf() + this.utcOffset() * 60 * 1000).toISOString().replace('Z', formatMoment(m, 'Z'))
      }
    }
    return formatMoment(m, utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ')
  }

  /**
   * Return a human readable representation of a moment that can
   * also be evaluated to get a new moment which is the same
   *
   * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
   */
  function inspect() {
    if (!this.isValid()) {
      return 'moment.invalid(/* ' + this._i + ' */)'
    }
    var func = 'moment'
    var zone = ''
    if (!this.isLocal()) {
      func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone'
      zone = 'Z'
    }
    var prefix = '[' + func + '("]'
    var year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY'
    var datetime = '-MM-DD[T]HH:mm:ss.SSS'
    var suffix = zone + '[")]'

    return this.format(prefix + year + datetime + suffix)
  }

  function format(inputString) {
    if (!inputString) {
      inputString = this.isUtc() ? hooks.defaultFormatUtc : hooks.defaultFormat
    }
    var output = formatMoment(this, inputString)
    return this.localeData().postformat(output)
  }

  function from(time, withoutSuffix) {
    if (this.isValid() && ((isMoment(time) && time.isValid()) || createLocal(time).isValid())) {
      return createDuration({ to: this, from: time }).locale(this.locale()).humanize(!withoutSuffix)
    } else {
      return this.localeData().invalidDate()
    }
  }

  function fromNow(withoutSuffix) {
    return this.from(createLocal(), withoutSuffix)
  }

  function to(time, withoutSuffix) {
    if (this.isValid() && ((isMoment(time) && time.isValid()) || createLocal(time).isValid())) {
      return createDuration({ from: this, to: time }).locale(this.locale()).humanize(!withoutSuffix)
    } else {
      return this.localeData().invalidDate()
    }
  }

  function toNow(withoutSuffix) {
    return this.to(createLocal(), withoutSuffix)
  }

  // If passed a locale key, it will set the locale for this
  // instance.  Otherwise, it will return the locale configuration
  // variables for this instance.
  function locale(key) {
    var newLocaleData

    if (key === undefined) {
      return this._locale._abbr
    } else {
      newLocaleData = getLocale(key)
      if (newLocaleData != null) {
        this._locale = newLocaleData
      }
      return this
    }
  }

  var lang = deprecate(
    'moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.',
    function (key) {
      if (key === undefined) {
        return this.localeData()
      } else {
        return this.locale(key)
      }
    },
  )

  function localeData() {
    return this._locale
  }

  var MS_PER_SECOND = 1000
  var MS_PER_MINUTE = 60 * MS_PER_SECOND
  var MS_PER_HOUR = 60 * MS_PER_MINUTE
  var MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR

  // actual modulo - handles negative numbers (for dates before 1970):
  function mod$1(dividend, divisor) {
    return ((dividend % divisor) + divisor) % divisor
  }

  function localStartOfDate(y, m, d) {
    // the date constructor remaps years 0-99 to 1900-1999
    if (y < 100 && y >= 0) {
      // preserve leap years using a full 400 year cycle, then reset
      return new Date(y + 400, m, d) - MS_PER_400_YEARS
    } else {
      return new Date(y, m, d).valueOf()
    }
  }

  function utcStartOfDate(y, m, d) {
    // Date.UTC remaps years 0-99 to 1900-1999
    if (y < 100 && y >= 0) {
      // preserve leap years using a full 400 year cycle, then reset
      return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS
    } else {
      return Date.UTC(y, m, d)
    }
  }

  function startOf(units) {
    var time
    units = normalizeUnits(units)
    if (units === undefined || units === 'millisecond' || !this.isValid()) {
      return this
    }

    var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate

    switch (units) {
      case 'year':
        time = startOfDate(this.year(), 0, 1)
        break
      case 'quarter':
        time = startOfDate(this.year(), this.month() - (this.month() % 3), 1)
        break
      case 'month':
        time = startOfDate(this.year(), this.month(), 1)
        break
      case 'week':
        time = startOfDate(this.year(), this.month(), this.date() - this.weekday())
        break
      case 'isoWeek':
        time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1))
        break
      case 'day':
      case 'date':
        time = startOfDate(this.year(), this.month(), this.date())
        break
      case 'hour':
        time = this._d.valueOf()
        time -= mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR)
        break
      case 'minute':
        time = this._d.valueOf()
        time -= mod$1(time, MS_PER_MINUTE)
        break
      case 'second':
        time = this._d.valueOf()
        time -= mod$1(time, MS_PER_SECOND)
        break
    }

    this._d.setTime(time)
    hooks.updateOffset(this, true)
    return this
  }

  function endOf(units) {
    var time
    units = normalizeUnits(units)
    if (units === undefined || units === 'millisecond' || !this.isValid()) {
      return this
    }

    var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate

    switch (units) {
      case 'year':
        time = startOfDate(this.year() + 1, 0, 1) - 1
        break
      case 'quarter':
        time = startOfDate(this.year(), this.month() - (this.month() % 3) + 3, 1) - 1
        break
      case 'month':
        time = startOfDate(this.year(), this.month() + 1, 1) - 1
        break
      case 'week':
        time = startOfDate(this.year(), this.month(), this.date() - this.weekday() + 7) - 1
        break
      case 'isoWeek':
        time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1) + 7) - 1
        break
      case 'day':
      case 'date':
        time = startOfDate(this.year(), this.month(), this.date() + 1) - 1
        break
      case 'hour':
        time = this._d.valueOf()
        time += MS_PER_HOUR - mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR) - 1
        break
      case 'minute':
        time = this._d.valueOf()
        time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1
        break
      case 'second':
        time = this._d.valueOf()
        time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1
        break
    }

    this._d.setTime(time)
    hooks.updateOffset(this, true)
    return this
  }

  function valueOf() {
    return this._d.valueOf() - (this._offset || 0) * 60000
  }

  function unix() {
    return Math.floor(this.valueOf() / 1000)
  }

  function toDate() {
    return new Date(this.valueOf())
  }

  function toArray() {
    var m = this
    return [m.year(), m.month(), m.date(), m.hour(), m.minute(), m.second(), m.millisecond()]
  }

  function toObject() {
    var m = this
    return {
      years: m.year(),
      months: m.month(),
      date: m.date(),
      hours: m.hours(),
      minutes: m.minutes(),
      seconds: m.seconds(),
      milliseconds: m.milliseconds(),
    }
  }

  function toJSON() {
    // new Date(NaN).toJSON() === null
    return this.isValid() ? this.toISOString() : null
  }

  function isValid$2() {
    return isValid(this)
  }

  function parsingFlags() {
    return extend({}, getParsingFlags(this))
  }

  function invalidAt() {
    return getParsingFlags(this).overflow
  }

  function creationData() {
    return {
      input: this._i,
      format: this._f,
      locale: this._locale,
      isUTC: this._isUTC,
      strict: this._strict,
    }
  }

  // FORMATTING

  addFormatToken(0, ['gg', 2], 0, function () {
    return this.weekYear() % 100
  })

  addFormatToken(0, ['GG', 2], 0, function () {
    return this.isoWeekYear() % 100
  })

  function addWeekYearFormatToken(token, getter) {
    addFormatToken(0, [token, token.length], 0, getter)
  }

  addWeekYearFormatToken('gggg', 'weekYear')
  addWeekYearFormatToken('ggggg', 'weekYear')
  addWeekYearFormatToken('GGGG', 'isoWeekYear')
  addWeekYearFormatToken('GGGGG', 'isoWeekYear')

  // ALIASES

  addUnitAlias('weekYear', 'gg')
  addUnitAlias('isoWeekYear', 'GG')

  // PRIORITY

  addUnitPriority('weekYear', 1)
  addUnitPriority('isoWeekYear', 1)

  // PARSING

  addRegexToken('G', matchSigned)
  addRegexToken('g', matchSigned)
  addRegexToken('GG', match1to2, match2)
  addRegexToken('gg', match1to2, match2)
  addRegexToken('GGGG', match1to4, match4)
  addRegexToken('gggg', match1to4, match4)
  addRegexToken('GGGGG', match1to6, match6)
  addRegexToken('ggggg', match1to6, match6)

  addWeekParseToken(['gggg', 'ggggg', 'GGGG', 'GGGGG'], function (input, week, config, token) {
    week[token.substr(0, 2)] = toInt(input)
  })

  addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
    week[token] = hooks.parseTwoDigitYear(input)
  })

  // MOMENTS

  function getSetWeekYear(input) {
    return getSetWeekYearHelper.call(this, input, this.week(), this.weekday(), this.localeData()._week.dow, this.localeData()._week.doy)
  }

  function getSetISOWeekYear(input) {
    return getSetWeekYearHelper.call(this, input, this.isoWeek(), this.isoWeekday(), 1, 4)
  }

  function getISOWeeksInYear() {
    return weeksInYear(this.year(), 1, 4)
  }

  function getWeeksInYear() {
    var weekInfo = this.localeData()._week
    return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy)
  }

  function getSetWeekYearHelper(input, week, weekday, dow, doy) {
    var weeksTarget
    if (input == null) {
      return weekOfYear(this, dow, doy).year
    } else {
      weeksTarget = weeksInYear(input, dow, doy)
      if (week > weeksTarget) {
        week = weeksTarget
      }
      return setWeekAll.call(this, input, week, weekday, dow, doy)
    }
  }

  function setWeekAll(weekYear, week, weekday, dow, doy) {
    var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
      date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear)

    this.year(date.getUTCFullYear())
    this.month(date.getUTCMonth())
    this.date(date.getUTCDate())
    return this
  }

  // FORMATTING

  addFormatToken('Q', 0, 'Qo', 'quarter')

  // ALIASES

  addUnitAlias('quarter', 'Q')

  // PRIORITY

  addUnitPriority('quarter', 7)

  // PARSING

  addRegexToken('Q', match1)
  addParseToken('Q', function (input, array) {
    array[MONTH] = (toInt(input) - 1) * 3
  })

  // MOMENTS

  function getSetQuarter(input) {
    return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + (this.month() % 3))
  }

  // FORMATTING

  addFormatToken('D', ['DD', 2], 'Do', 'date')

  // ALIASES

  addUnitAlias('date', 'D')

  // PRIORITY
  addUnitPriority('date', 9)

  // PARSING

  addRegexToken('D', match1to2)
  addRegexToken('DD', match1to2, match2)
  addRegexToken('Do', function (isStrict, locale) {
    // TODO: Remove "ordinalParse" fallback in next major release.
    return isStrict ? locale._dayOfMonthOrdinalParse || locale._ordinalParse : locale._dayOfMonthOrdinalParseLenient
  })

  addParseToken(['D', 'DD'], DATE)
  addParseToken('Do', function (input, array) {
    array[DATE] = toInt(input.match(match1to2)[0])
  })

  // MOMENTS

  var getSetDayOfMonth = makeGetSet('Date', true)

  // FORMATTING

  addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear')

  // ALIASES

  addUnitAlias('dayOfYear', 'DDD')

  // PRIORITY
  addUnitPriority('dayOfYear', 4)

  // PARSING

  addRegexToken('DDD', match1to3)
  addRegexToken('DDDD', match3)
  addParseToken(['DDD', 'DDDD'], function (input, array, config) {
    config._dayOfYear = toInt(input)
  })

  // HELPERS

  // MOMENTS

  function getSetDayOfYear(input) {
    var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1
    return input == null ? dayOfYear : this.add(input - dayOfYear, 'd')
  }

  // FORMATTING

  addFormatToken('m', ['mm', 2], 0, 'minute')

  // ALIASES

  addUnitAlias('minute', 'm')

  // PRIORITY

  addUnitPriority('minute', 14)

  // PARSING

  addRegexToken('m', match1to2)
  addRegexToken('mm', match1to2, match2)
  addParseToken(['m', 'mm'], MINUTE)

  // MOMENTS

  var getSetMinute = makeGetSet('Minutes', false)

  // FORMATTING

  addFormatToken('s', ['ss', 2], 0, 'second')

  // ALIASES

  addUnitAlias('second', 's')

  // PRIORITY

  addUnitPriority('second', 15)

  // PARSING

  addRegexToken('s', match1to2)
  addRegexToken('ss', match1to2, match2)
  addParseToken(['s', 'ss'], SECOND)

  // MOMENTS

  var getSetSecond = makeGetSet('Seconds', false)

  // FORMATTING

  addFormatToken('S', 0, 0, function () {
    return ~~(this.millisecond() / 100)
  })

  addFormatToken(0, ['SS', 2], 0, function () {
    return ~~(this.millisecond() / 10)
  })

  addFormatToken(0, ['SSS', 3], 0, 'millisecond')
  addFormatToken(0, ['SSSS', 4], 0, function () {
    return this.millisecond() * 10
  })
  addFormatToken(0, ['SSSSS', 5], 0, function () {
    return this.millisecond() * 100
  })
  addFormatToken(0, ['SSSSSS', 6], 0, function () {
    return this.millisecond() * 1000
  })
  addFormatToken(0, ['SSSSSSS', 7], 0, function () {
    return this.millisecond() * 10000
  })
  addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
    return this.millisecond() * 100000
  })
  addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
    return this.millisecond() * 1000000
  })

  // ALIASES

  addUnitAlias('millisecond', 'ms')

  // PRIORITY

  addUnitPriority('millisecond', 16)

  // PARSING

  addRegexToken('S', match1to3, match1)
  addRegexToken('SS', match1to3, match2)
  addRegexToken('SSS', match1to3, match3)

  var token
  for (token = 'SSSS'; token.length <= 9; token += 'S') {
    addRegexToken(token, matchUnsigned)
  }

  function parseMs(input, array) {
    array[MILLISECOND] = toInt(('0.' + input) * 1000)
  }

  for (token = 'S'; token.length <= 9; token += 'S') {
    addParseToken(token, parseMs)
  }
  // MOMENTS

  var getSetMillisecond = makeGetSet('Milliseconds', false)

  // FORMATTING

  addFormatToken('z', 0, 0, 'zoneAbbr')
  addFormatToken('zz', 0, 0, 'zoneName')

  // MOMENTS

  function getZoneAbbr() {
    return this._isUTC ? 'UTC' : ''
  }

  function getZoneName() {
    return this._isUTC ? 'Coordinated Universal Time' : ''
  }

  var proto = Moment.prototype

  proto.add = add
  proto.calendar = calendar$1
  proto.clone = clone
  proto.diff = diff
  proto.endOf = endOf
  proto.format = format
  proto.from = from
  proto.fromNow = fromNow
  proto.to = to
  proto.toNow = toNow
  proto.get = stringGet
  proto.invalidAt = invalidAt
  proto.isAfter = isAfter
  proto.isBefore = isBefore
  proto.isBetween = isBetween
  proto.isSame = isSame
  proto.isSameOrAfter = isSameOrAfter
  proto.isSameOrBefore = isSameOrBefore
  proto.isValid = isValid$2
  proto.lang = lang
  proto.locale = locale
  proto.localeData = localeData
  proto.max = prototypeMax
  proto.min = prototypeMin
  proto.parsingFlags = parsingFlags
  proto.set = stringSet
  proto.startOf = startOf
  proto.subtract = subtract
  proto.toArray = toArray
  proto.toObject = toObject
  proto.toDate = toDate
  proto.toISOString = toISOString
  proto.inspect = inspect
  proto.toJSON = toJSON
  proto.toString = toString
  proto.unix = unix
  proto.valueOf = valueOf
  proto.creationData = creationData
  proto.year = getSetYear
  proto.isLeapYear = getIsLeapYear
  proto.weekYear = getSetWeekYear
  proto.isoWeekYear = getSetISOWeekYear
  proto.quarter = proto.quarters = getSetQuarter
  proto.month = getSetMonth
  proto.daysInMonth = getDaysInMonth
  proto.week = proto.weeks = getSetWeek
  proto.isoWeek = proto.isoWeeks = getSetISOWeek
  proto.weeksInYear = getWeeksInYear
  proto.isoWeeksInYear = getISOWeeksInYear
  proto.date = getSetDayOfMonth
  proto.day = proto.days = getSetDayOfWeek
  proto.weekday = getSetLocaleDayOfWeek
  proto.isoWeekday = getSetISODayOfWeek
  proto.dayOfYear = getSetDayOfYear
  proto.hour = proto.hours = getSetHour
  proto.minute = proto.minutes = getSetMinute
  proto.second = proto.seconds = getSetSecond
  proto.millisecond = proto.milliseconds = getSetMillisecond
  proto.utcOffset = getSetOffset
  proto.utc = setOffsetToUTC
  proto.local = setOffsetToLocal
  proto.parseZone = setOffsetToParsedOffset
  proto.hasAlignedHourOffset = hasAlignedHourOffset
  proto.isDST = isDaylightSavingTime
  proto.isLocal = isLocal
  proto.isUtcOffset = isUtcOffset
  proto.isUtc = isUtc
  proto.isUTC = isUtc
  proto.zoneAbbr = getZoneAbbr
  proto.zoneName = getZoneName
  proto.dates = deprecate('dates accessor is deprecated. Use date instead.', getSetDayOfMonth)
  proto.months = deprecate('months accessor is deprecated. Use month instead', getSetMonth)
  proto.years = deprecate('years accessor is deprecated. Use year instead', getSetYear)
  proto.zone = deprecate('moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/', getSetZone)
  proto.isDSTShifted = deprecate(
    'isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information',
    isDaylightSavingTimeShifted,
  )

  function createUnix(input) {
    return createLocal(input * 1000)
  }

  function createInZone() {
    return createLocal.apply(null, arguments).parseZone()
  }

  function preParsePostFormat(string) {
    return string
  }

  var proto$1 = Locale.prototype

  proto$1.calendar = calendar
  proto$1.longDateFormat = longDateFormat
  proto$1.invalidDate = invalidDate
  proto$1.ordinal = ordinal
  proto$1.preparse = preParsePostFormat
  proto$1.postformat = preParsePostFormat
  proto$1.relativeTime = relativeTime
  proto$1.pastFuture = pastFuture
  proto$1.set = set

  proto$1.months = localeMonths
  proto$1.monthsShort = localeMonthsShort
  proto$1.monthsParse = localeMonthsParse
  proto$1.monthsRegex = monthsRegex
  proto$1.monthsShortRegex = monthsShortRegex
  proto$1.week = localeWeek
  proto$1.firstDayOfYear = localeFirstDayOfYear
  proto$1.firstDayOfWeek = localeFirstDayOfWeek

  proto$1.weekdays = localeWeekdays
  proto$1.weekdaysMin = localeWeekdaysMin
  proto$1.weekdaysShort = localeWeekdaysShort
  proto$1.weekdaysParse = localeWeekdaysParse

  proto$1.weekdaysRegex = weekdaysRegex
  proto$1.weekdaysShortRegex = weekdaysShortRegex
  proto$1.weekdaysMinRegex = weekdaysMinRegex

  proto$1.isPM = localeIsPM
  proto$1.meridiem = localeMeridiem

  function get$1(format, index, field, setter) {
    var locale = getLocale()
    var utc = createUTC().set(setter, index)
    return locale[field](utc, format)
  }

  function listMonthsImpl(format, index, field) {
    if (isNumber(format)) {
      index = format
      format = undefined
    }

    format = format || ''

    if (index != null) {
      return get$1(format, index, field, 'month')
    }

    var i
    var out = []
    for (i = 0; i < 12; i++) {
      out[i] = get$1(format, i, field, 'month')
    }
    return out
  }

  // ()
  // (5)
  // (fmt, 5)
  // (fmt)
  // (true)
  // (true, 5)
  // (true, fmt, 5)
  // (true, fmt)
  function listWeekdaysImpl(localeSorted, format, index, field) {
    if (typeof localeSorted === 'boolean') {
      if (isNumber(format)) {
        index = format
        format = undefined
      }

      format = format || ''
    } else {
      format = localeSorted
      index = format
      localeSorted = false

      if (isNumber(format)) {
        index = format
        format = undefined
      }

      format = format || ''
    }

    var locale = getLocale(),
      shift = localeSorted ? locale._week.dow : 0

    if (index != null) {
      return get$1(format, (index + shift) % 7, field, 'day')
    }

    var i
    var out = []
    for (i = 0; i < 7; i++) {
      out[i] = get$1(format, (i + shift) % 7, field, 'day')
    }
    return out
  }

  function listMonths(format, index) {
    return listMonthsImpl(format, index, 'months')
  }

  function listMonthsShort(format, index) {
    return listMonthsImpl(format, index, 'monthsShort')
  }

  function listWeekdays(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdays')
  }

  function listWeekdaysShort(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort')
  }

  function listWeekdaysMin(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin')
  }

  getSetGlobalLocale('en', {
    dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
    ordinal: function (number) {
      var b = number % 10,
        output = toInt((number % 100) / 10) === 1 ? 'th' : b === 1 ? 'st' : b === 2 ? 'nd' : b === 3 ? 'rd' : 'th'
      return number + output
    },
  })

  // Side effect imports

  hooks.lang = deprecate('moment.lang is deprecated. Use moment.locale instead.', getSetGlobalLocale)
  hooks.langData = deprecate('moment.langData is deprecated. Use moment.localeData instead.', getLocale)

  var mathAbs = Math.abs

  function abs() {
    var data = this._data

    this._milliseconds = mathAbs(this._milliseconds)
    this._days = mathAbs(this._days)
    this._months = mathAbs(this._months)

    data.milliseconds = mathAbs(data.milliseconds)
    data.seconds = mathAbs(data.seconds)
    data.minutes = mathAbs(data.minutes)
    data.hours = mathAbs(data.hours)
    data.months = mathAbs(data.months)
    data.years = mathAbs(data.years)

    return this
  }

  function addSubtract$1(duration, input, value, direction) {
    var other = createDuration(input, value)

    duration._milliseconds += direction * other._milliseconds
    duration._days += direction * other._days
    duration._months += direction * other._months

    return duration._bubble()
  }

  // supports only 2.0-style add(1, 's') or add(duration)
  function add$1(input, value) {
    return addSubtract$1(this, input, value, 1)
  }

  // supports only 2.0-style subtract(1, 's') or subtract(duration)
  function subtract$1(input, value) {
    return addSubtract$1(this, input, value, -1)
  }

  function absCeil(number) {
    if (number < 0) {
      return Math.floor(number)
    } else {
      return Math.ceil(number)
    }
  }

  function bubble() {
    var milliseconds = this._milliseconds
    var days = this._days
    var months = this._months
    var data = this._data
    var seconds, minutes, hours, years, monthsFromDays

    // if we have a mix of positive and negative values, bubble down first
    // check: https://github.com/moment/moment/issues/2166
    if (!((milliseconds >= 0 && days >= 0 && months >= 0) || (milliseconds <= 0 && days <= 0 && months <= 0))) {
      milliseconds += absCeil(monthsToDays(months) + days) * 864e5
      days = 0
      months = 0
    }

    // The following code bubbles up values, see the tests for
    // examples of what that means.
    data.milliseconds = milliseconds % 1000

    seconds = absFloor(milliseconds / 1000)
    data.seconds = seconds % 60

    minutes = absFloor(seconds / 60)
    data.minutes = minutes % 60

    hours = absFloor(minutes / 60)
    data.hours = hours % 24

    days += absFloor(hours / 24)

    // convert days to months
    monthsFromDays = absFloor(daysToMonths(days))
    months += monthsFromDays
    days -= absCeil(monthsToDays(monthsFromDays))

    // 12 months -> 1 year
    years = absFloor(months / 12)
    months %= 12

    data.days = days
    data.months = months
    data.years = years

    return this
  }

  function daysToMonths(days) {
    // 400 years have 146097 days (taking into account leap year rules)
    // 400 years have 12 months === 4800
    return (days * 4800) / 146097
  }

  function monthsToDays(months) {
    // the reverse of daysToMonths
    return (months * 146097) / 4800
  }

  function as(units) {
    if (!this.isValid()) {
      return NaN
    }
    var days
    var months
    var milliseconds = this._milliseconds

    units = normalizeUnits(units)

    if (units === 'month' || units === 'quarter' || units === 'year') {
      days = this._days + milliseconds / 864e5
      months = this._months + daysToMonths(days)
      switch (units) {
        case 'month':
          return months
        case 'quarter':
          return months / 3
        case 'year':
          return months / 12
      }
    } else {
      // handle milliseconds separately because of floating point math errors (issue #1867)
      days = this._days + Math.round(monthsToDays(this._months))
      switch (units) {
        case 'week':
          return days / 7 + milliseconds / 6048e5
        case 'day':
          return days + milliseconds / 864e5
        case 'hour':
          return days * 24 + milliseconds / 36e5
        case 'minute':
          return days * 1440 + milliseconds / 6e4
        case 'second':
          return days * 86400 + milliseconds / 1000
        // Math.floor prevents floating point math errors here
        case 'millisecond':
          return Math.floor(days * 864e5) + milliseconds
        default:
          throw new Error('Unknown unit ' + units)
      }
    }
  }

  // TODO: Use this.as('ms')?
  function valueOf$1() {
    if (!this.isValid()) {
      return NaN
    }
    return this._milliseconds + this._days * 864e5 + (this._months % 12) * 2592e6 + toInt(this._months / 12) * 31536e6
  }

  function makeAs(alias) {
    return function () {
      return this.as(alias)
    }
  }

  var asMilliseconds = makeAs('ms')
  var asSeconds = makeAs('s')
  var asMinutes = makeAs('m')
  var asHours = makeAs('h')
  var asDays = makeAs('d')
  var asWeeks = makeAs('w')
  var asMonths = makeAs('M')
  var asQuarters = makeAs('Q')
  var asYears = makeAs('y')

  function clone$1() {
    return createDuration(this)
  }

  function get$2(units) {
    units = normalizeUnits(units)
    return this.isValid() ? this[units + 's']() : NaN
  }

  function makeGetter(name) {
    return function () {
      return this.isValid() ? this._data[name] : NaN
    }
  }

  var milliseconds = makeGetter('milliseconds')
  var seconds = makeGetter('seconds')
  var minutes = makeGetter('minutes')
  var hours = makeGetter('hours')
  var days = makeGetter('days')
  var months = makeGetter('months')
  var years = makeGetter('years')

  function weeks() {
    return absFloor(this.days() / 7)
  }

  var round = Math.round
  var thresholds = {
    ss: 44, // a few seconds to seconds
    s: 45, // seconds to minute
    m: 45, // minutes to hour
    h: 22, // hours to day
    d: 26, // days to month
    M: 11, // months to year
  }

  // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
  function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
    return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture)
  }

  function relativeTime$1(posNegDuration, withoutSuffix, locale) {
    var duration = createDuration(posNegDuration).abs()
    var seconds = round(duration.as('s'))
    var minutes = round(duration.as('m'))
    var hours = round(duration.as('h'))
    var days = round(duration.as('d'))
    var months = round(duration.as('M'))
    var years = round(duration.as('y'))

    var a = (seconds <= thresholds.ss && ['s', seconds]) ||
      (seconds < thresholds.s && ['ss', seconds]) ||
      (minutes <= 1 && ['m']) ||
      (minutes < thresholds.m && ['mm', minutes]) ||
      (hours <= 1 && ['h']) ||
      (hours < thresholds.h && ['hh', hours]) ||
      (days <= 1 && ['d']) ||
      (days < thresholds.d && ['dd', days]) ||
      (months <= 1 && ['M']) ||
      (months < thresholds.M && ['MM', months]) ||
      (years <= 1 && ['y']) || ['yy', years]

    a[2] = withoutSuffix
    a[3] = +posNegDuration > 0
    a[4] = locale
    return substituteTimeAgo.apply(null, a)
  }

  // This function allows you to set the rounding function for relative time strings
  function getSetRelativeTimeRounding(roundingFunction) {
    if (roundingFunction === undefined) {
      return round
    }
    if (typeof roundingFunction === 'function') {
      round = roundingFunction
      return true
    }
    return false
  }

  // This function allows you to set a threshold for relative time strings
  function getSetRelativeTimeThreshold(threshold, limit) {
    if (thresholds[threshold] === undefined) {
      return false
    }
    if (limit === undefined) {
      return thresholds[threshold]
    }
    thresholds[threshold] = limit
    if (threshold === 's') {
      thresholds.ss = limit - 1
    }
    return true
  }

  function humanize(withSuffix) {
    if (!this.isValid()) {
      return this.localeData().invalidDate()
    }

    var locale = this.localeData()
    var output = relativeTime$1(this, !withSuffix, locale)

    if (withSuffix) {
      output = locale.pastFuture(+this, output)
    }

    return locale.postformat(output)
  }

  var abs$1 = Math.abs

  function sign(x) {
    return (x > 0) - (x < 0) || +x
  }

  function toISOString$1() {
    // for ISO strings we do not use the normal bubbling rules:
    //  * milliseconds bubble up until they become hours
    //  * days do not bubble at all
    //  * months bubble up until they become years
    // This is because there is no context-free conversion between hours and days
    // (think of clock changes)
    // and also not between days and months (28-31 days per month)
    if (!this.isValid()) {
      return this.localeData().invalidDate()
    }

    var seconds = abs$1(this._milliseconds) / 1000
    var days = abs$1(this._days)
    var months = abs$1(this._months)
    var minutes, hours, years

    // 3600 seconds -> 60 minutes -> 1 hour
    minutes = absFloor(seconds / 60)
    hours = absFloor(minutes / 60)
    seconds %= 60
    minutes %= 60

    // 12 months -> 1 year
    years = absFloor(months / 12)
    months %= 12

    // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
    var Y = years
    var M = months
    var D = days
    var h = hours
    var m = minutes
    var s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : ''
    var total = this.asSeconds()

    if (!total) {
      // this is the same as C#'s (Noda) and python (isodate)...
      // but not other JS (goog.date)
      return 'P0D'
    }

    var totalSign = total < 0 ? '-' : ''
    var ymSign = sign(this._months) !== sign(total) ? '-' : ''
    var daysSign = sign(this._days) !== sign(total) ? '-' : ''
    var hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : ''

    return (
      totalSign +
      'P' +
      (Y ? ymSign + Y + 'Y' : '') +
      (M ? ymSign + M + 'M' : '') +
      (D ? daysSign + D + 'D' : '') +
      (h || m || s ? 'T' : '') +
      (h ? hmsSign + h + 'H' : '') +
      (m ? hmsSign + m + 'M' : '') +
      (s ? hmsSign + s + 'S' : '')
    )
  }

  var proto$2 = Duration.prototype

  proto$2.isValid = isValid$1
  proto$2.abs = abs
  proto$2.add = add$1
  proto$2.subtract = subtract$1
  proto$2.as = as
  proto$2.asMilliseconds = asMilliseconds
  proto$2.asSeconds = asSeconds
  proto$2.asMinutes = asMinutes
  proto$2.asHours = asHours
  proto$2.asDays = asDays
  proto$2.asWeeks = asWeeks
  proto$2.asMonths = asMonths
  proto$2.asQuarters = asQuarters
  proto$2.asYears = asYears
  proto$2.valueOf = valueOf$1
  proto$2._bubble = bubble
  proto$2.clone = clone$1
  proto$2.get = get$2
  proto$2.milliseconds = milliseconds
  proto$2.seconds = seconds
  proto$2.minutes = minutes
  proto$2.hours = hours
  proto$2.days = days
  proto$2.weeks = weeks
  proto$2.months = months
  proto$2.years = years
  proto$2.humanize = humanize
  proto$2.toISOString = toISOString$1
  proto$2.toString = toISOString$1
  proto$2.toJSON = toISOString$1
  proto$2.locale = locale
  proto$2.localeData = localeData

  proto$2.toIsoString = deprecate('toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)', toISOString$1)
  proto$2.lang = lang

  // Side effect imports

  // FORMATTING

  addFormatToken('X', 0, 0, 'unix')
  addFormatToken('x', 0, 0, 'valueOf')

  // PARSING

  addRegexToken('x', matchSigned)
  addRegexToken('X', matchTimestamp)
  addParseToken('X', function (input, array, config) {
    config._d = new Date(parseFloat(input, 10) * 1000)
  })
  addParseToken('x', function (input, array, config) {
    config._d = new Date(toInt(input))
  })

  // Side effect imports

  hooks.version = '2.24.0'

  setHookCallback(createLocal)

  hooks.fn = proto
  hooks.min = min
  hooks.max = max
  hooks.now = now
  hooks.utc = createUTC
  hooks.unix = createUnix
  hooks.months = listMonths
  hooks.isDate = isDate
  hooks.locale = getSetGlobalLocale
  hooks.invalid = createInvalid
  hooks.duration = createDuration
  hooks.isMoment = isMoment
  hooks.weekdays = listWeekdays
  hooks.parseZone = createInZone
  hooks.localeData = getLocale
  hooks.isDuration = isDuration
  hooks.monthsShort = listMonthsShort
  hooks.weekdaysMin = listWeekdaysMin
  hooks.defineLocale = defineLocale
  hooks.updateLocale = updateLocale
  hooks.locales = listLocales
  hooks.weekdaysShort = listWeekdaysShort
  hooks.normalizeUnits = normalizeUnits
  hooks.relativeTimeRounding = getSetRelativeTimeRounding
  hooks.relativeTimeThreshold = getSetRelativeTimeThreshold
  hooks.calendarFormat = getCalendarFormat
  hooks.prototype = proto

  // currently HTML5 input type only supports 24-hour formats
  hooks.HTML5_FMT = {
    DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm', // <input type="datetime-local" />
    DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss', // <input type="datetime-local" step="1" />
    DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS', // <input type="datetime-local" step="0.001" />
    DATE: 'YYYY-MM-DD', // <input type="date" />
    TIME: 'HH:mm', // <input type="time" />
    TIME_SECONDS: 'HH:mm:ss', // <input type="time" step="1" />
    TIME_MS: 'HH:mm:ss.SSS', // <input type="time" step="0.001" />
    WEEK: 'GGGG-[W]WW', // <input type="week" />
    MONTH: 'YYYY-MM', // <input type="month" />
  }
  hooks.defineLocale('zh-cn', {
    months: '一月_二月_三月_四月_五月_六月_七月_八月_九月_十月_十一月_十二月'.split('_'),
    monthsShort: '1月_2月_3月_4月_5月_6月_7月_8月_9月_10月_11月_12月'.split('_'),
    weekdays: '星期日_星期一_星期二_星期三_星期四_星期五_星期六'.split('_'),
    weekdaysShort: '周日_周一_周二_周三_周四_周五_周六'.split('_'),
    weekdaysMin: '日_一_二_三_四_五_六'.split('_'),
    longDateFormat: {
      LT: 'Ah点mm分',
      LTS: 'Ah点m分s秒',
      L: 'YYYY-MM-DD',
      LL: 'YYYY年MMMD日',
      LLL: 'YYYY年MMMD日Ah点mm分',
      LLLL: 'YYYY年MMMD日ddddAh点mm分',
      l: 'YYYY-MM-DD',
      ll: 'YYYY年MMMD日',
      lll: 'YYYY年MMMD日Ah点mm分',
      llll: 'YYYY年MMMD日ddddAh点mm分',
    },
    meridiemParse: /凌晨|早上|上午|中午|下午|晚上/,
    meridiemHour: function (hour, meridiem) {
      if (hour === 12) {
        hour = 0
      }
      if (meridiem === '凌晨' || meridiem === '早上' || meridiem === '上午') {
        return hour
      } else if (meridiem === '下午' || meridiem === '晚上') {
        return hour + 12
      } else {
        // '中午'
        return hour >= 11 ? hour : hour + 12
      }
    },
    meridiem: function (hour, minute, isLower) {
      var hm = hour * 100 + minute
      if (hm < 600) {
        return '凌晨'
      } else if (hm < 900) {
        return '早上'
      } else if (hm < 1130) {
        return '上午'
      } else if (hm < 1230) {
        return '中午'
      } else if (hm < 1800) {
        return '下午'
      } else {
        return '晚上'
      }
    },
    calendar: {
      sameDay: function () {
        return this.minutes() === 0 ? '[今天]Ah[点整]' : '[今天]LT'
      },
      nextDay: function () {
        return this.minutes() === 0 ? '[明天]Ah[点整]' : '[明天]LT'
      },
      lastDay: function () {
        return this.minutes() === 0 ? '[昨天]Ah[点整]' : '[昨天]LT'
      },
      nextWeek: function () {
        var startOfWeek, prefix
        startOfWeek = moment().startOf('week')
        prefix = this.unix() - startOfWeek.unix() >= 7 * 24 * 3600 ? '[下]' : '[本]'
        return this.minutes() === 0 ? prefix + 'dddAh点整' : prefix + 'dddAh点mm'
      },
      lastWeek: function () {
        var startOfWeek, prefix
        startOfWeek = moment().startOf('week')
        prefix = this.unix() < startOfWeek.unix() ? '[上]' : '[本]'
        return this.minutes() === 0 ? prefix + 'dddAh点整' : prefix + 'dddAh点mm'
      },
      sameElse: 'LL',
    },
    ordinalParse: /\d{1,2}(日|月|周)/,
    ordinal: function (number, period) {
      switch (period) {
        case 'd':
        case 'D':
        case 'DDD':
          return number + '日'
        case 'M':
          return number + '月'
        case 'w':
        case 'W':
          return number + '周'
        default:
          return number
      }
    },
    relativeTime: {
      future: '%s内',
      past: '%s前',
      s: '几秒',
      m: '1 分钟',
      mm: '%d 分钟',
      h: '1 小时',
      hh: '%d 小时',
      d: '1 天',
      dd: '%d 天',
      M: '1 个月',
      MM: '%d 个月',
      y: '1 年',
      yy: '%d 年',
    },
    week: {
      // GB/T 7408-1994《数据元和交换格式·信息交换·日期和时间表示法》与ISO 8601:1988等效
      dow: 1, // Monday is the first day of the week.
      doy: 4, // The week that contains Jan 4th is the first week of the year.
    },
  })

  return hooks
})
